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。
2
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。
3
The measurement result is optimized by using the rotating grating for splitting laser light and producing frequency shift to determine the fluid direction.