人是动物的一种。
Without habits nothing recognizable as a human or even animal form of life would be possible.
如果没有习惯,就无法识别出作为人或者动物的生命形式。
To a large extent, the physical form and the habits of the earth's vegetation and its animal life have been molded by the environment.
在很大程度上,地球上动植物的形态以及习性都是由外部环境所塑造的。
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