感到困惑

The difficult problem present by him entangle the conferee.

他所提出的问使与会人士困惑。

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

那位教授从来不会困惑，也不会被任何问所倒。

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

他然更困惑，因为这突如其来的一笑，使他莫名其妙。