感到困惑

The difficult problem present by him entangle the conferee.

他所提出问题使与会人士感。

The professor is never at a nonplus, and never perplexed by a problem.

那位教授从不会感，也不会被任何问题所难倒。

He was still more perplexed, for this inconsequent smile made nothing clear.

他然更加感，因为这突如一笑，使他感莫名妙。