The trench is most sharply defined on the eastern (continental) side: depth plunges rapidly from a few hundred meters (light blue) to several thousand meters (deep blue).
海沟最明显的界限是东部靠大陆的地方：海水深度突然从两三百米（浅蓝色）迅速降低到数千米（深蓝色）。
This married-by-thirty rule serves as a sort of Continental Divide, shaping the dating landscape on either side of it.
这条“三十以前结婚”的准则就像是一道分水岭——这两边的风景大不相同。
The way further south into the rest of America was through an ice-free corridor between the Rocky Mountains on the Pacific side, and the vast continental ice-sheet covering Canada on the other.
当年一道巨大的无冰走廊，一头向着通过太平洋一侧的洛基山脉一路向南延伸至美国各地，另一头深深延伸至被大陆冰层覆盖着的加拿大广袤土地。
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