vt.

1. （不用被动态）使痛苦，使苦恼；使不适
   Do you know what ails that crying child?

   你知道那哭着的孩子什么地方不舒服吗？

vi.

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

   她已病了好久了。

2. 处境艰难
   That country's ailing economy has become a big problem.

   那个国家不景气的经济已成为一个大问题。

n.

1. 病痛；苦恼

v.