You cannot have a negative sentence after unless because that would make the sentence a double negative and senseless.
在unless之后不能接否定句，因为这就造成了双重否定，句子没有意义。
The tristable resonant tunneling devices(RTD)with a double negative differential resistance in its I-V characteristics have a high current ratio(5.
在I-V特性曲线上具有双微分负阻的三稳态共振隧穿器件，室温下可以达到较高的电流峰谷比5。
However, in languages that do not have negative concord, such as Standard English and German, a double negative is understood to resolve into a positive.
然而在那些不具有否定和谐的语言中，比如标准英语和德语，双重否定会形成肯定。
Admittedly, this property is a confusing one because it reads like a double negative, but by default, all read and unread documents are tracked in a database.
大家都认为这条属性令人费解，因为它读起来像是一个双重否定句，但是在默认情况下，数据库中所有已读的和未读的文档都会被跟踪。
The author thinks that this literature experienced a double negative process:from the mountains and rivers in literature to the Literature of Mountain and River, then back again.
认为中国古代的山水文学经过了由文学中的山水到山水文学，再回归于文学中的山水这一否定之否定的过程；
The lofty jobless rate, coupled with a large backlog of home foreclosures and high levels of negative home equity, posed risks of a "double dip" in the housing market, it said.
IMF在报告中表示，居高不下的失业率，再加上房屋止赎(home foreclosure)问题积压严重、房屋负资产值持续保持高水平，使得美国房地产业陷入双重危机。
The result is a double-layer distribution of charges-for example, a plane of negative heads and an adjacent diffuse cloud of positive counterions.
这就产生了电荷的一种双层结构分布——比如说一个负电荷的平面和紧邻着弥散着的带正电的相对离子云。
Network is a "double-edged sword," when it provides a great convenience for the students' study life, it also has serious negative effects upon the college students' morality.
网络是一把“双刃剑”，它在给大学生的学习生涯提供极大便利的同时，也给大学生的思惟道德带来严峻的负面影响。
The traditional taboo of the Tujia nationality is a double - edged sword, which has both positive and negative influences on the life of Tujia nationality.
土家族传统禁忌是一把双刃剑，对土家族精神生活与物质生活有积极意义和消极作用，二者共生互存，杂于一体。
The double negative sentences in English is a tremendous difficulty for beginners in their learning of English.
英语中的双重否定句是初学英语者学习句法的难点之一。
Based on load transferring concept, this paper puts up a new method which USES double broken line model to calculate the negative friction of pile.
基于荷载传递函数的概念，提出了一种用双折线模型来计算桩负摩阻力的方法。
A model for simplified second order analysis of the double resistance to lateral force system is built on the basis to transform second order effect into negative stiffness.
为简化双重抗侧力体系二阶分析，将结构的二阶效应转化为结构的负刚度，从而建立分析模型。
Based on load transferring concept, the author puts up with a new method which USES double broken line model to calculate negative friction.
本文基于荷载传递函数的概念，提出了一种用双折线模型来计算负摩阻力的新方法。
The peripherization of literature, which is a literary phenomenon, is just like a double-edged sword that is of both positive significance and negative influence.
作为一种文学现象，文学边缘化对文学而言，就好比是一把双刃剑，既有积极意义，也难免有消极影响。
Athletics likes a sword with double blades which can bring us not only physical and mental joviality but also the negative influence on the society.
竞技体育犹如一把“双刃剑”，在给人们带来身心愉悦的同时，也给社会带来一些负面的影响。
Based on the analysis of the negative permeability properties of double split-ring-resonator array (SRRA), a simplified structure called single SRRA was proposed and demonstrated.
对双金属环阵列结构产生负磁导率的机理进行了分析，在此基础上，尝试采用单金属环阵列结构来构造负磁导率材料。
But deposit insurance is also a double-edged sword, which has its own negative effect, such as moral risk, converse choice, and etc.
但是存款保险也是一柄“双刃剑”，也有其负面效应，如道德风险、逆向选择等。
A new method is adopted to real-timely monitor DC system insulation, which applies double asymmetrical Bridges to keep it effective when positive and negative pole insulations drop in same proportion.
采用了一种常态下利用双不对称电桥实时监测直流系统绝缘的方法，解决了正负母线绝缘均按比例下降时失效的问题。
The internet technology is a double-edged sword:while it is extending human capability, it also brings about some negative effects.
网络技术是把“双刃剑” ，它在延伸人类能力的同时，也存在负面影响。
The incentive scheme applied to human resource management at enterprises can sometimes be a double-edged sword with negative reaction and effects attained.
企业人力资源管理中运用的激励手段，有时会收到负面的反应和效果。
In accordance with the value of technology point of view, technology is a "double-edged sword", the negative effect of technology and technology is the same positive effect on coexistence.
依照技术价值论的观点来看，技术是一柄“双刃剑”，技术的负效应与技术的正效应是同时并存的。
On a microclimate meter, 9 different methods of ar-ranging silk velvet and chinese crepe are designed, including positive surface, negative surface, singletayer and double layer.
本文设计了包括正面、反面、单层、双层等九种方案，对其传热传湿性的结果进行数学处理，并对丝绒织物正、反面的传热湿性进行了定量描述。
To improve the validity of user identity authentication mechanism, a two-double authentication model integrating positive authentication mechanism and negative authentication mechanism was given.
为了提高用户身份认证的有效性，给出了一个集成肯定认证机制和否定认证机制的双层认证模型。
As a kind of marked negation, metalinguistic negation is usually marked by the double-sentence structure, consisting of a basic negative sentence plus another positive or negative sentence.
元语否定作为一种标记否定，它的标记形式一般为由本句和义句构成的复句结构式。
On the other hand, Internet is like a double-blade sword that has brought them a lot of negative effects besides its positive ones.
但是网络又是一把双刃剑，它在给人们带来巨大而深远影响的同时，也给大学生带来了诸多的负面影响。
At the same time, it is like a double-edged sword for China's positive role in the economy also has its negative impact.
同时，它也犹如一把双刃剑，对我国经济产生积极作用的同时也有其负面影响。
This double usage of language, which gives to the same word a positive and negative meaning, is not an accident, and gives no ground for reproaching language as a cause of confusion.
这个词的两种用法，使得其具有积极和消极的两种含义，这并不是偶然所为，也不能因此指斥语言产生混乱。
This double usage of language, which gives to the same word a positive and negative meaning, is not an accident, and gives no ground for reproaching language as a cause of confusion.
这个词的两种用法，使得其具有积极和消极的两种含义，这并不是偶然所为，也不能因此指斥语言产生混乱。
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