求助化学高手帮帮我..

1.you should ask your teacher whether there could be some dangers in
the experiment.Security must be first considered.
2.you should practise the experiment beforehand to make clear the best way to achieve it.
3.you should teach others the mothed and knowledge concerning about
the experiment before conducting it.
4.tell them the procedures,then srart the experiment

新手要做实验了````> <~

他是让你说出做实验的步骤……如果这是书上摘下来的题一般书上都会有的```别懒````= =

你已经踏入了科学的殿堂，并且必须做科学实验，那么在做实验之前该做些什么呢
分步写出答案

我不是英语好手 啊!!~!~!~!~!~1翻译后在来给我看