this is where it can get tricky.Each department has a list of courses that are major requirements.

问题描述:

this is where it can get tricky.Each department has a list of courses that are major requirements.
this is where it can get tricky.

trick 的通常意思是“诀窍”,但在这里 tricky 是俚语式的用法,大概意思是“棘手”.
this is where it can get tricky 是说
在这方面,问题可能有点棘手(或巧妙),需要用点心机.