First, the weapons should be intended for use only in retaliation after a nuclear attack. Second, the possession of the weapons must be a temporary expedient.
首先，这些武器应当只在遭受核袭击后反击时才使用。其次，这些武器的拥有必须是一种临时的应急手段。
The soil is depleted first by crops grown in it and second by bacterial action.
土壤首先被其中生长的农作物消耗，其次被细菌活动消耗。
All the students had their teeth X-rayed at the end of the first and second years.
所有的学生都在一年级和二年级结束时做了牙齿X 光检查。
The first step, as Erik Brynjolfsson and Andrew McAfee argue in The Second Machine Age, should be rethinking education and job training.
正如埃里克·布莱恩约弗森和安德鲁·迈克菲在《第二次机器时代》中所论证的那样，第一步应当是反思教育和职业培训。
She came first in the examination in the physical sciences in 1893, and in 1894 was placed second in the examination in mathematical sciences.
1893年，她在物理科学考试中获得第一名，1894年，她在数学科学考试中获得第二名。
In the first place you are not old, Conway. And in the second place, you are a very strong and appealing man.
首先，你不老，康韦。其次，你是个非常强壮、有魅力的男人。
The first picture was taken from the side of the building, and the second one endways on.
第一张照片照的是楼房侧面，第二张照的是楼房正面。
For the first time in the World Cup finals, lots had to be drawn to decide who would finish second and third.
世界杯决赛中首次由抽签决定谁将获得第二名和第三名。
OK, we'll have a careful look at the content of your case study in a minute, but I just want to make a general comment first, before you start writing your second draft.
好的，我们稍后会仔细看一下你的案例研究的内容，但是在你开始写第二稿之前，我想先做一个大概的评论。
Steel's fragility at low temperatures first became a major concern during the Second World War.
第二次世界大战期间，钢在低温下的易碎性首次成为人们关注的主要问题。
The development of an understanding of the self becomes evident between the first and second years of life and shows rapid elaboration in subsequent years.
对自我理解的发展在生命的头一两年间变得明显，在随后的几年里快速地变得详尽。
Dr. Sasaki found, as expected, the participants slept less well on their first night than they did on their second, taking more than twice as long to fall asleep and sleeping less overall.
佐佐木教授发现，正如预期的那样，参与者们在第一晚的睡眠质量不如第二晚，入睡所需时间是第二晚的两倍多，且总体睡眠时间也更少。
One type of pattern was of a specific density and was to be classified as dense, while the second type of pattern could vary in density, but was always less dense than the first one.
一种图案具有特定的密集度，被归为“密集”类，另一类图案的密集程度不同，但都比第一种的密集程度低。
For each character in the first string, any letter that appears in the second string is replaced by the corresponding letter from the third-string.
对于第一个字符串中的每个字符，第二个字符串中的任意一个字符都由第三个字符串中相应的字母所替代。
"I shall make you tell me about Rajahs presently," he said, "but first tell me what the second thing was."
“你以后再告诉我印度王公的事，”他说，“先告诉我第二件事是什么。”
There were actually two periods of rain and lake formation: the first one began about 37,000 years ago; and the second one dates from about 10,000 years ago.
事实上，这里有两个时期的降雨和湖泊形成：第一个始于大约37000年前；而第二个可以追溯到约一万年前。
Nearly three-quarters of the first group guessed that Mr.Williams worked at a managerial level, while only 38.5 percent of the second group thought so.
第一组中有近四分之三的人认为威廉姆斯先生从事管理层工作，而第二组中仅有38.5%的人这样认为。
Nearly three-quarters of the first group guessed that Mr. Williams worked at a managerial level, while only 38.5 percent of the second group thought so.
第一组中有近四分之三的人认为威廉姆斯先生从事管理层工作，而第二组中仅有38.5%的人是这样认为的。
Surprisingly, more patients in the second group showed the desired effect than those in the first group.
令人惊讶的是，第二组的病人比第一组的病人更能达到预期的效果。
Though the first set—{1,6,2}—intuitively seems more random than the second—{3,3,3}, they are each as likely to occur, and thus according to the accepted definition, must be considered equally random.
虽然第一个集合——{1,6,2}直观上看起来比第二个集合——{3,3,3}更随机，但它们都有可能发生，因此根据公认的定义，必须被认为是同等随机的。
At last we saw my collection! It had a label on it, marked "First Prize", and next to it came the boy's moss, marked "Second Prize".
我们终于看到了我的收藏品！上面有一个标签，标着“一等奖”，旁边是男孩的苔藓，标着“二等奖”。
This second chimpanzee is not a relative of the first chimpanzee, and they've never seen each other before.
第二只黑猩猩不是第一只黑猩猩的亲戚，它们以前也从来没见过面。
The monastery consists of two churches. The first one was built in 642 A.D., and the second was completed in the late 17th century.
修道院包括了两座教堂。第一座建造于公元642年，而第二座则完工于17世纪末期。
When the two groups were tested on what they'd learned, the second group "significantly outperformed" the first.
当对两组学生的学习内容进行测试时，第二组“明显优于”第一组。
Some have compared the Hollywood studio system to a factory, and it is useful to remember that studios were out to make money first and art second.
有些人将好莱坞的电影制片厂制度比作工厂，而且有一点要记住的是，制片厂的首要任务是赚钱，其次才是艺术。
Connect your main branches to the central picture and connect your second-and-third-level branches to the first and second levels, etc.
将你的主要分支连接到中间图片，并将你的第二级和第三级分支连接到第一级和第二级，以此类推。
Players from both countries believed strongly in the idea of friendship first, competition second.
两国选手都坚信友谊第一，比赛第二的理念。
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