They will not be solved unless people who live in cities, like most of us, actually start doing a better job, because right now, we are not doing a very good one.
这些问题是不会得到解决的，除非 居住在城市里的人们—— 就像我们在座的大多数—— 真正行动起来， 因为现在我们做的还很不够。