你好，很高兴为你解答，希望帮到你be experienced at对…有经验 at指对象 be experienced at+sth（n）/doing sth(v) He is very experienced at mending cars.他修车很有经验。be experienced in 在……有经验 in通常指某个领域，方面be experienced in+doing sthAn executive should be experienced in administration.

一个管理者应有行政管理的经验。

二者大体上意思差不多，没有太严格的区别