它们的身体密度很高,没有办法不下沉。
不下沉的细小的固体的颗粒与液体或气体的混合物。
Mixture of fine particles of any solid with a liquid or gas that does not settle out.
摆姿势的时候,身体侧边应当呈一直线,不下沉也不弯曲。
When getting in to position, your side should be a straight line, not sagging or curved.
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