It used to be, two, three hundred years ago, that a lawn was a symbol of prestige, and so it was only the very rich that could keep these green actually, deserts: they're totally sterile.
二三百年前草坪曾经 象征荣誉和地位， 所以那时候只有很富有的人才能享有那些绿色的草坪， 实际上，是绿色沙漠：因为它们没有一点儿生机。