kàn dào / zhè / dào / nán tí / xiǎo míng / zhuā ěr náo sāi / bù / zhī / rú hé / xià bǐ

看到这道难题，小明抓耳挠腮，不知如何下笔。

Seeing this difficult problem, Xiaoming scratched his head and cheeks, not knowing how to start writing.