A mother is very good at using every chance to educate his son, who was only three years old.
一位母亲十分善于利用每一个机会对孩子进行教育。她的儿子只有三岁。

One day, she took a plug and said to her son, " Look, there are two pieces of copper, so it must be plugged in a place where there are two holes. Where do you think it should be plugged?" She waited for an answer expectfully .
一天，她拿着一个插头对儿子说：“看，这里有两个铜片，那它一定要插在有两个孔的地方。你说它应该插在哪儿呢？”母亲期待着儿子的回答。

"Plug in nose." is the answer.
“插在鼻子里！”儿子回答说。

Notes:

　　(1 ) be good at 擅长于

　　(2) copper n. 铜

　　(3) expectfully adv.期待地