摸底细: feel out; sound out; try to find out the real intention or situation
恐怕: 1.(表示估计兼担心) i'm afraid; fear 短语和例子恐怕不成。 i'm afraid it won't do. 我恐怕不能来。 i'm afraid i can't come. “我们迟到了吗?” “恐怕是迟到了。” “are we late?” “i'm afraid so.”恐怕不是这样吧! i am afraid not.2.(表示估计) perhap