在这个实验中，两个光门测量小球的初速度。
For this activity, two photogates measure the initial speed of the ball.
单摆实验是用来测量当地重力加速度的。
Mono-pendulum experiment is used to measure local weight acceleration of gravity.
实验结果表明：该系统可以实现对目标物的精确距离速度测量。
Our experimental results indicate that the system can locate the target accurately.
实验结果表明：该系统可以实现对目标物的精确距离速度测量。
Our experimental results indicate that the system can locate the target accurately.
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