at home in something

• 熟悉；精通

at home in something的用法和样例：

例句

1. I needed some orientation at this stage.
   我在这个阶段需要熟悉情况。
2. Here is his home town which he knows up and down.
   这儿是他十分熟悉的家乡。
3. He is skilled in upstairs politics.
   他精通上层政治。
4. I am completely at home in mathematics.
   我精通数学。

词汇搭配

• at home in something 熟悉