scatterbrain

noun

1. 思想不集中的人；健忘的人
   a person who is always losing or forgetting things and cannot think in an organized way

1. What a scatterbrain! he's locked his key inside his room again.
   他老是这么丢三落四的。瞧，这回又把钥匙锁屋里了。
2. He's such a scatterbrain, always forgetting to lock the door.
   他是个马大哈，老忘锁门。
3. What a scatterbrain! She forgot to plug in the coffee maker.
   真是个糊涂虫！他忘了给咖啡壶插电。
4. He likes to give the impression of being a bit of a scatterbrain, but he's actually extremely efficient and well-organized.
   他喜欢给人一种大大咧咧的印象，但实际上却是极其能干和有条有理的。
5. He is always very careless, that's why he is nicknamed "scatterbrain".
   他做事总是稀里马虎的，所以大家都叫他“马大哈”。
6. Mary is such a scatterbrain that she always forgets something.
   玛莉糊里糊涂的，她总是忘东忘西。
7. Conclusion: Abnormity of catecholaminergic neurotransmitters metabolism might lead to scatterbrain, hyperactivity, and difficult studying in patients with ADHD.
   结论：单胺类神经递质代谢异常可能是导致ADHD患儿注意力不能集中、活动过度、学习困难的原因之一。

noun

1. a flighty and disorganized person

   Synonym:    forgetful person