When you couldn't open your mouth till the first two years on the earth, inner voice helps you understand things.
来到地球上的最初两年,你还不能开口说话,那时,内心的声音帮助你理解事物。
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While the North in a narrow sense refers to the east from Liao He till the west of Inner Mongolia and Longxi, namely the "northern cultural region" called by the archaeologists.
When you couldn't open your mouth till the first two years on planet earth, inner voice is the one through which you interpreted and understood things.