1.There is no more dangerous experiment than that of trying to appear what one is not.
在人前装模作样，是比什么还要危险的尝试了。
2.Had Franklin known what we know about lightning in those days, he probably would not have undertaken such a dangerous experiment.
如果富兰克林当时与今天我们关于闪电知识的认识一样，他可能不会进行那种危险的（风筝）试验了。
3.The teacher said, "Watch me. I'm doing a dangerous experiment. Now watch me. I switch on the current, and stand back. . . "
教师说，“现在看着我，我做一个危险的实验。注意，我现在接通电流，往后站……”