不要让你的背向下凹陷！
在这个向下凹陷的干船坞里，一台先进的起重机提起大量的型钢，为伊朗订购的巨型油轮做总装。
In the cavernous dry dock, a modern crane lifts massive steel sections for final assembly of a gigantic oil tanker ordered by Iran.
如果你站在最高的主楼塔上，对着圆形塔向下看，你会发现一个位于屋顶斜坡间的矩形的凹陷。
If you're on the tallest mansion tower, and look down towards the circular tower, you should spot a rectangular recess between the slopes of the roof.
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