Strangely enough, whereas in the past the inhabitants of one street all knew each other, nowadays people on the same floor in tower blocks don't even say hello to each other.
奇怪的是，过去住在同一条街上的人彼此都认识，而现在住在同一层楼的人甚至都不打招呼了。
They say hello to each other in a friendly way.
他们以一种友好的方式相互打招呼。
They agreed to say hello to each other every day through QQ, later XuSong crush on music.
他们约定每天通过QQ彼此问好，后来许嵩迷上音乐。
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