碍事【ài shì】
be in the way; impede the progress of an affair; be a hindrance
[动短] 1、妨碍做事，造成不方便 2、严重，大有关系
我们应该限制参加这项工程的人数，因为人多反而碍事。
A limit should be put to the number of the people involved in the project, for too many people would become a hindrance.
只是擦破点儿皮，不碍事的。
It doesn't matter because It is just a minor bruise.
安【ān】
1. ease; settle down 2. install 3. quiet; calm; peaceful; tranquil; safe
[动] 1、使平静 2、安装，设置 [形] 3、平静，稳定
只有国家强盛了，人民才能安居乐业。
People can not lead a peaceful and prosperous life unless their country becomes strong.
如今，中国的大部分家庭都安上了电话。
Nowadays, most households in China have telephone sets installed.
科研人员又将一颗卫星平安地送上了太空。
The scientists have succeeded in launching another satellite.
安定【ān dìng】
1. quiet; settled; stable; calm and orderly 2. stabilize
[形]1、（生活、形势等）平静、正常、稳定 [动]2、使安然、稳定
他放弃了原先安定的工作，开始自己创业。
He gave up a stable job and set up his own business.
在国外安定下来后，他开始想念家乡的父母了。
He came to miss his parents back at the home after he had settled down abroad.
他这个人太爱面子，明明没有多少钱，还偏要掏钱请客。
他给我们读了一首歌颂爱情的十四行诗。
对于那些与爱人分居两地的业务骨干，要优先为他们安置新家。
她心目中的爱人必须是能够理解她的伴侣。
每个人都应为残疾人献出一份爱心。
妈妈做饭时从不让我在一旁，嫌我碍手碍脚。
