①Give up the kid stuff and find a real job.

　　把这儿戏般的事辞了，找一份正经工作吧。

　　②These questions are kid stuff.

　　这些问题极容易回答。

　　Child's play:

　　易如反掌

　　例句：

　　Once you've mastered English, learning other languages should be child's play.

　　一旦你掌握了英语，学其他语言也易如反掌。

　　It's a piece of cake:

　　轻而易举，小菜一碟

　　例句：

　　Once I've done that, it's a piece of cake.

　　一旦你做到了这一点，接下来的事情就是小菜一碟。

　　It's as easy as pie:

　　易如反掌

　　例句：

　　Come on! Even a child could do that, it's as easy as pie.

　　快点(别犹豫)了，这个太容易了，连小孩子都会。