n.做,不能接受,难以完成,事件 v.做( do的现在分词 ),干,学习,研究
She laboured under the illusion that I knew what I was doing.
她有一个错觉，以为我知道自己在做什么。
It is a sneaky and underhand way of doing business.
这种做生意的方式偷偷摸摸，遮遮掩掩。
On her own ground she knows exactly what she's doing.
她在自己熟悉的领域里对自己的行为有十足的把握。