马大哈

tā shì gè mǎ dà hā lǎo shì wàng suǒ mén

他是个马大哈，老是忘锁门。

He's such a scatterbrain that he always forgets to lock the door.

yī gè zhèng zhì shang de mǎ dà hā

一个政治上的马大哈

a political scatterbrain

tā shì gè mǎ dà hā zuò shì zǒng diū sān là sì

他是个马大哈，做事总丢三落四。

He is such a scatterbrain that he always forgets something whenever he does anything.

tā kě zhēn gòu mǎ dà hā de zì jǐ diū le biǎo jū rán bù zhī dào

他可真够马大哈的，自己丢了表，居然不知道。

How careless he is! He even doesn't know that he's lost his watch.

nǐ tài mǎ dà hā le a

你太马大哈了啊。

You're too careless.

jiào shī duì zì jǐ de gōng zuò jué duì bù néng mǎ dà hā

教师对自己的工作绝对不能马大哈。

Teachers must not be careless about their work.