There are unique considerations when it comes to urban farming, Wally says: He can't grow crops that will get too tall, or else they will absorb too much pollution.
当谈到市区种植时，有个特别的问题，Wally说他种的农作物不能长得太高，否则它们会吸收太多的污染。
I think we should discourage people from using their private cars. They produce too much pollution!
我觉得我们应该劝人们尽量少开私家车。汽车制造的污染太严重了！
I think we should discourage people from using their private cars. They produce too much pollution!
我觉得我们应该劝人们尽量少开私家车。汽车制造的污染太严重了！
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