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。
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.
脚微微分开，伸展，双手和视线往上，看向天花板。在伸展的时候感觉到延伸的感觉并深深呼吸。
Feet slightly apart, reach and look up towards the ceiling with your arms and eyes. Feel the stretch and take in a deep breath as you reach up.
现在看来，在太阳系初期行星和小行星首次形成时，冰深深地延伸进入主带区域。
It now appears when the asteroids and planets were first forming in the very early Solar System ice extended far into the Main Belt region.
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