这常常会在地面上留下一个个巨大的坑，有毒的矸子山和污染的河道。
This often results in huge holes in the ground, noxious spoil-heaps and polluted watercourses.
当鱼儿游动时，鱼尾会留下一个个小漩涡，当它们成群游动时，它们可以通过这些漩涡转换能量。
When fish swim, they leave little swirling vortices in their wake. By swimming together in a school, they can transfer energy to one another through these vortices.
也许许多年后，这些老街只能留在照片中和人们的回忆中，只留下一个个熟悉的地名让人遐想、回味。
Maybe many years later, all these streets are only in pictures and our memories and only theirs names can remind us of their classic beauties.
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