The lab must work out the principle of duty, the watch must check up the power, the water pipe, the window and the door to make sure the lab is safe.

实验室应建立安全值班制度，值班人员应负责锁门、检查电源、水管、门窗等，以确保安全。

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Before faucet installation, please make sure to clean up objects in the pipe;

安装龙头前，请务必清理管中杂物。

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Before faucet installation, please make sure to clean up objects in the pipe;

安装龙头前，请务必清理管中杂物。

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