s只能用在人名或者地名之后.Tom's parents, Shanghai's population
of则没什么限制基本上都可以用,the parents of Tom, the population of Shanghai, the beauty of the world (这个不能用's)
s只能用在人名或者地名之后.Tom's parents, Shanghai's population
of则没什么限制基本上都可以用,the parents of Tom, the population of Shanghai, the beauty of the world (这个不能用's)