You'll be able to change background colors by either rotating the mouse wheel or using the left and right shift keys.
您将能够通过旋转鼠标滚轮或使用左和右shif t键更改背景色。
A new device which can change the optical frequency shift is described. It consists of a rotating grating, a synchro motor and a power supply whose frequency can be adjusted.
本文描述一台能改变光频移频率的新装置，它由旋转光栅、同步电机和调频电源组成。
The measurement result is optimized by using the rotating grating for splitting laser light and producing frequency shift to determine the fluid direction.
采用旋转光栅分束产生频移来辨别流向，使测量最佳化。
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