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。
Lab test is the important method to check the valid of new theory.
模拟实验是检验理论有效性的重要实践手段。
Lab test is the important method to check the valid of new theory.
模拟实验是检验理论有效性的重要实践手段。
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