1. Many people believe that grammar is the sine qua non of language learning.
   许多人认为学习语法在学习语言中是必不可少的。
2. According to the theory of scalar diffraction, first, the equipollence of spatial distribution of the plane-wave interferential field and parallel projective sine grating is discussed.
   摘要根据标量衍射理论，首先讨论了两平面波干涉场的空间分布与平行投影正弦光栅的等价性。
3. Firstly, there are two types of winding patterns for toroidal vessel: spiral winding along toroidal vessel geodesics and analogous sine placement along the external surface of toroidal vessel.
   首先，环形容器缠绕线型主要有两种类型：沿稳定测地线的螺旋缠绕和类似正弦外包罗铺放。
4. In this method, the sine, cosine signal is converted by three line autosyn and its output is a binary code based on AD2S83.The measurement datum can be read and displayed by computer.
   着重研究了自整角机的三相信号通过隔离转换电路转换成正、余弦信号，输入到高精度AD2S83的轴角／数字转换电路转换成二进制数字信号，供给计算机系统读数显示。

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