往往一件事都是有利有弊的. 用英语怎么说?

almost everything has the good side and bed side
或者用谚语
every coin has two sides

Every coin has two sides.
Everything has its advantages and disadvantages

every coin has two sides.

Usually, all the things have their pros and cos

As a coin has two sides,there are always advantages and disadvantages of things.

just as the old saying goes, every coin has two sides.