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1. This continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2,500-3,500 fathoms.
    大陆架慢坡一般是从差不多100英寻水深的地方开始的,一直延伸到几百英里远深达2,500至3,500的地方,那里才是真正的海底。

2. Like adolescents they stand before the mirror, and still cannot fathom the exact outline of the vision before them.
    犹如希腊神话中那位漂亮的少年,站在镜前,不能辨认自身的真面目。

3. I cannot fathom his remarks.
    我不能完全理解他的话.