“I'm an expert at controlling my anger.” By She-Hulk: Attorney at Law. 「我善於控制我的憤怒，我經常如此，街上有人對我吹口哨，能力差的男人 ... ... <看更多>

If you want to become an expert in Python, you should definitely watch this PyData talk from James Powell.EVENT: PyData, 2017SPEAKER: James ... ... <看更多>

They do seem interchangeable but to me "expert in" implies doing knowledge rather than knowing knowledge. So "expert in kung fu" is clearly ... ... <看更多>