vt.

1. （不用被動態）使痛苦，使苦惱；使不適
   Do you know what ails that crying child?

   你知道那哭著的孩子什麼地方不舒服嗎？

vi.

1. 感到不適，生病
   She has been ailing for a long time.

   她已病了好久了。

2. 處境艱難
   That country's ailing economy has become a big problem.

   那個國家不景氣的經濟狀況已成為一個大問題。

n.

1. 病痛；苦惱

v.