人们怀疑它们是被拖过陆地的。

People doubt that they were dragged over the land.

鲍勃怀疑地展开了那张纸条。

Doubtfully, Bob unfolded the note.

他有一刻的怀疑。

He had a moment of doubt.

所以有些人怀疑发明者是否自己想出了这个主意。

So some people doubt whether the inventor came up with the idea himself or herself.

卢克怀疑年轻人总是面临道德困境。

Luke doubts that young people face moral dilemmas all the time.