miàn / duì / zhè / ge / wèn / tí / jiào / shòu / chén / yín / piàn / kè / hòu / cái / kāi / kǒu / huí / dá

面对这个问题，教授沉吟片刻后才开口回答。

Faced with the question, the professor pondered silently for a moment before answering.