doubt:
n. 怀疑疑问疑惑
v. 怀疑不信恐怕拿不准
There was little doubt in my mind.
我心里几乎没有疑问。
There is good reason to doubt this.
有正当理由怀疑这件事。
I doubt the feasibility of the plan.
我怀疑这个计划的可行性。
A doubt niggled at her.
一丝疑惑困扰着她。
There seemed to be no doubt about it.
此事似乎毫无疑问。
wonder:
v. 想知道（用于询问时）不知道感到疑惑感到诧异感到惊叹
n. 惊讶奇迹能人有特效的东西
adj. 极好的，灵验的神奇的
I wonder you don't feel it too.
我惊讶于你也感觉不到它。
I wonder if you can help me.
不知您是否能帮我的忙
I wonder who that letter was from.
我不知道是谁来的信。
