[法]下降;
For it is the nature of a log or stone to remain motionless on level ground, and to move when on a slope; if four-cornered, to come to a standstill, but if round-shaped, to go rolling down.
木石的性情是处于平坦地势上就静止不动,处于陡峭的斜坡上就滚动,方形容易静止,圆形容易滚动。
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