Hái / zi / tū / rán / wèn / chū / zhè / ge / wèn / tí / lǎo / shī / yì / shí / zhèng / zhù / bù / zhī / dào / gāi / zěn / me / huí / dá

孩子突然问出这个问题，老师一时怔住，不知道该怎么回答。

The child suddenly asked this question, leaving the teacher momentarily dumbfounded and unsure how to respond.