newbie - 新手，菜鸟

I just started using Weixin a few days ago. I'm still a newbie.

我几天前刚开始玩微信，现在还处于菜鸟级别。

rookie mistake 低级错误

rookie mistake字面理解就是新手才犯的错误，也就是我们常说的低级错误

A: I thought there was something wrong with my camera. 我以为我的照相机坏了。 But then I realized I forgot to take the lens cap off. 结果发现是我忘记开镜头盖。Now I feel stupid. 我怎么那么二啊。

B: hahaha That's hilarious. What a rookie mistake!

哈哈哈。太搞笑了。 这么低级的错误你也犯！

amateur hour - 形容某件事情做的很业余，不够专业，不够给力。

A: Baijie! You are late!

白洁，你迟到了！

B: Oh Ms. Smith, I forgot we had a meeting today.

哦史密斯女士，我忘记今天要开会了。

A: What is this, amateur hour?!

你怎么回事？那么不专业！

B: I'm so sorry for making such a rookie mistake!

犯这么低级的错误, 真是不好意思。

beginner's luck - 初学者的好运气

Ryan hit a strike the first time he went bowling. Either he's a natural, or it's just beginner's luck.

Ryan第一次打保龄球就全中! 要么他天生就适合玩这个，不然就是初学者的好运气。