At last they went to the dining-car. Two rows of Negro waiters, in glowing white suits, surveyed their entrance with the interest, and also the equanimity (平静), of men who had been forewarned. 这是以前没有看懂的一个句子，不知道把 of men 接到哪里，entrance? 感觉也不对。今天翻出笔记本来把它抄上来，希望老师给讲解一下，这个 of men 是怎么一个结构，这句话说了个什么意思？