experiment：实验

experience：经历

Have you ever experienced such moments? 你经历过这些时刻吗

fill out a form：填写表格

repeatedly：频繁地

So you check it repeatedly. 所以你频繁地查看

constantly：不断地

You constantly fear that you haven’t locked the door or turned off the electricity 你不断地担心你没有锁好门和关掉电

time and again：一次又一次

there is no need for sb to do sth: 某人没必要做某事

There is no need for you to inspect them time and again. 你没必要反复检查

英文的举例子就按照正常的句子一句一句就好了，英文没有冒号和分号。举例子的句式一样即可，如:

When A. When B.