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老师:
Now, this is the chemistry lab. Have you been in the lab before? 
好啦.这就是化学实验室.你们以前来过这个实验室吗?
学生1:
No.
没有.
老师:
OK, listen carefully, please. First of all, don`t come here without a teacher. That`s not allowed. Once you are in here, listen to your teacher. Do what he or she tells you to do. Follow your teacher`s instructions. Don`t touch anything unless your teache
好，请仔细听着。首先，没有老师带领不要来这里。这是不允许的，一旦进来了，要听老师吩咐。按照他（她）所告诉你们的去做。要听从老师的教导。除非老师允许，否则你们不要动任何东西。做完实验后，请把实验室清理干净，并把所有的东西放回器柜。你们都明白吗？
学生1:
Yes.
明白了.
学生2:
What about when we leave?
我们离开实验室又该做些什么呢? 
老师:
That`s very important. Before you leave the lab make sure the electricity is turned off and the windows are shut. Finally, turn off the lights and lock the door. That`s all. Any other questions?
这很重要.你们离开实验室前.务必关上电源.关好窗户.最后把灯关掉.锁好门.就这些.还有什么问题吗?
学生3:
Are we allowed to use the basin by the side of the cupboard?
我们可以使用器柜旁边的那个水池吗?
老师:
Yes. Wash your hands with soap at the end of your experiment.
可以.实验结束时要用肥皂洗手.