图2：软件开发生命周期的螺旋模型
Figure 2: Spiral model of the software development lifecycle
虽然在一个周期内这三种竞争优势呈递减的态势，但是超出一个周期后便形成一种螺旋上升的结构，这种结构可以带动该产业不断升级。
Although the three kinds of competitive advantage decreases in a product life cycle, they are a kind of spiral rising structure in the long run.
用于电磁兼容试验的宽频带天线有很多类型，如双锥天线、对数周期天线、螺旋天线、喇叭天线等等。
There are all kinds of antennas used in EMC test such as biconical antennas, log periodic antenna, helical antenna, ridged horn antenna and etc.
法国兴业银行建议熊抛售美元和“短”，如科技，汽车周期性股票，旅游要避免成为“固有陷入通货紧缩的螺旋”。
SocGen advises bears to sell the dollar and to "short" cyclical equities such as technology, auto, and travel to avoid being caught in the "inherent deflationary spiral".
偏心螺旋矩形截面通道中流体速度随转角(弧度)呈非线性周期变化。
Flow velocity of fluid in eccentric spiral rectangular section channels varies in periodical non-linear relation with Angle of curve.
首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。
First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.
结果显示：涡管流函数是时间的周期函数，并被表征为一系列在涡核内均匀分布螺旋涡丝流函数的叠加。
The result showed that the stream function of vortex tube was expressed as the superposition of the stream functions of vortex filament within the vortex core.
用短时傅立叶分析的方法研究了辐射噪声在高频段时频变化的周期性，估计了目标的螺旋桨转速。
Period characteristics of radiated noise at high frequency is investigated by a method based on short time Fast Fourier Transformation, and propeller speed is estimated.
它的体积是木星的10倍，公转周期少于24小时，而且正沿着螺旋轨道奔向它所属的恒星表面，那里灼热无比。
It is 10 times the size of Jupiter, orbits its own star in under 24 hours and should soon be spiralling into the surface of its searingly-hot sun.
论文利用基于业务维生命周期的螺旋式开发方法来开发设备管理数据仓库系统。
The paper utilizes spiral development method based on business dimensional lifecycle to develop data warehouse system for equipment management.
采用传统的耦合模理论，建立了单螺旋手征长周期光纤光栅的耦合模方程，并以螺旋芯光纤为例进行了理论分析。
Using conventional coupled-mode theory, a set of coupled-mode equations are formulated for single-helix chiral fiber long-period gratings. A helical-core fiber is analyzed as an example.
采用传统的耦合模理论，建立了单螺旋手征长周期光纤光栅的耦合模方程，并以螺旋芯光纤为例进行了理论分析。
Using conventional coupled-mode theory, a set of coupled-mode equations are formulated for single-helix chiral fiber long-period gratings. A helical-core fiber is analyzed as an example.
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