You must experiment, reason, think out new devices.
你们必须做实验，推理，想出新方法。
You must finish this experiment (all) by yourself.
你必须独自地完成这个试验。
Once necessary, you must recheck the results of the experiment.
一旦有必要的话，你得将实验结果再核对一遍。
If you want to gain knowledge, you must take advantage of the experiment.
你要想获得知识，你就得利用这个实验。
You must do the experiment with great caution.
作实验时务必小心翼翼。
You must give us a hand in our experiment.
我知道戒烟很难，但是你一定不要放弃。
You must give us a hand in our experiment.
我知道戒烟很难，但是你一定不要放弃。
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