你好，高兴帮助//www.souquanme.com你。
请采纳，谢谢！！！
用at造句：
He rests at home.
他在家休息。
I picked Lucy up at the airport yesterday.
我昨天在机场接了露西。

At the age of ten,he can speak English fluently.
The apple tree is iInLwfdoyOn front of our house.

please look at the picture.
请看图片
供参考。

be good at +doing表示擅长做某事，前边的be动词注意根据时态和人称变化，后边的动词变成现在分词形式，就是ing形式。
I//www.souquanme.com was good at singing when I was in primary.我上小学的时候擅长唱歌。
They were good at playing football when they wereInLwfdoyO young.他们年轻的时候擅长踢足球。
如果不要求时态单纯说擅长的意思，就现在时www.souquanme.com就好。

Democrats also squawked at him.
民主党人也向他抗议。
Take things at a relaxed pace.
以一种放松的状态处理事情。
Several factors are at work.
成因存在于几方面。
I smiled at them and grimaced.
我朝她们笑笑并做了个鬼脸。