释义
a. 可疑的,疑心的,不确的
例句
1. Because of a long drought, the farmers are doubtful about the prospect of a good yield. 因为长时间的干旱，农民们对于好收成的前景是怀疑的。 2. It is doubtful whether he can read my fortune or not. 他能否算出我的运气还是个疑问。