When you work at a computer, the keyboard should be at elbow height, so your upper and lower arms form an Angle of 90 degrees or more and your forearms are supported by armrests.
当你在电脑前工作时，键盘应该和肘部齐高，这样你的大臂与小臂成90度角或更大的角度，小臂可以放在椅子扶手上。
When the angle of incidence is 45 degrees, the beam-combination mirror is designed to transmit long wavelength laser beams and the diode beams reflected at 90 degrees will be used to calibrate it.
合束镜设计用于45度入射时， 传输长波的激光束， 并利用90度反射的二激光光束来校准它。
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