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。
Close the landing door of the top floor, press the up or down button, check if they work well.
关闭顶层厅门，在轿顶点动操作上下行按钮，注意电梯运行方向，要与动作的按钮方向一致。
Close the landing door of the top floor, press the up or down button, check if they work well.
关闭顶层厅门，在轿顶点动操作上下行按钮，注意电梯运行方向，要与动作的按钮方向一致。
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