1、expert作形容词时，后面常接介词at或者in，比如he is expert at or in painting。

2、expert用于名词时，后面可接介词on、at或in，例如he is an expert on or at or in lung diseases。常见搭配：legal expert法律专家、Expert Team专家团队等。

相关例句：

1、Experts put the real figure at closer to 75%.

专家们估计真实的数字较接近于75%。

2、All of them are experts in their chosen field.

他们在各自选定的专业中都是专家。

3、Experts set a high valuation on the painting.

专家对这幅画估价很高。

4、Tom's our resident expert on foreign movies.

汤姆是我们自己的外国电影专家。

5、She's expert at making cheap but stylish clothes.

她擅长做便宜但雅致的服装。