I was clear that it should not have been done.

　　我確信那件事是不應該做的。

　　It also adds stress when you know that you have something to do that should have already been done.

　　而且只會讓你感覺到有時期應該完成而沒有完成的壓力。

　　Some argue that such work should never have been done in the first place and call for international monitoring of potentially harmful research.

　　一些人認為根本就不應該做這種工作，并呼吁對潛在的有害研究進行國際監(jiān)管。

　　It should have been done properly, not messed up like that.

　　活兒該干得有條有理，不是這樣亂七八糟的。