one of a set of small boxes , open at the front , in which letters and messages are left for different people
发音
例句
1. The pigeonhole principle is an important principle in combinatorics. 鸽巢原理是组合学中一个非常重要的原理。 2. I don't want to be pigeonholed as a kids' presenter. 我不想被归类为儿童节目主持人。