n.钥匙孔；（篮球）罚球区
adj.内幕的；偷偷打听的
His eyes were glued to the keyhole. 他的眼睛紧贴在钥匙孔上。
Every age has a keyhole to which its eye is pasted. 每个时代都有一个钥匙孔,通过它可以张望世界。
We know that he is a keyhole investigator. 我们晓得他是个暗地打听的调查人员。
