There's probably more than one way to accomplish this, but you'll do it by mounting a sonar sensor on the robot's left side.
有多种实现这一目标的方法，但是我们采用的方法是在机器人的左边安装一个声纳传感器。
If there's leakage or dilapidation of one or more smaller devices, the left can work as before, so to improve the safety.
当一个或几个小装置发生泄漏或破损时，其余的小装置仍能基本维持装置的功能，提高装置的安全性能。
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