Because of limitation of natural condition, the ash yard is selected in a mine out area after analysing and comparing in aspects of economy.

由于自然条件的限制，经多种方案的经济比较，灰场选择在煤矿采空区。

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And I used to play in the backyard with a boy whose yard adjoined mine.

那时我常常和隔壁的男孩在后院一起玩。

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