【上位】 (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration ある物質が、その物質の濃度の高い所から低いところへ動く過程。
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【下位】 the process of totally saturating something with a substance; "the impregnation of wood with preservative"; "the saturation of cotton with ether" ある物をある物質に完全に浸す過程。
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