he is of medium build他中等身材;she is thin他是瘦的.为什么第一个句子加了of第二个不加呢?

问题描述:

he is of medium build他中等身材;she is thin他是瘦的.为什么第一个句子加了of第二个不加呢?

of medium build 身材中等的:of +名词=形容词
thin是形容词