Breaking down food, absorbing nutrients, and expelling of waste requires chemical processing, mechanical mixing and rhythmic muscle contractions that move everything on down the line.
分解食物、吸收营养，排出废物，则需化学反应，机械搅拌，肌肉韵动三方协作。
Breaking down food, absorbing nutrients, and expelling of waste requires chemical processing, mechanical mixing and rhythmic muscle contractions that move everything on down the line.
分解食物、吸收营养，排出废物，则需化学反应，机械搅拌，肌肉韵动三方协作。
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