泛指伏邪在体内潜伏的部位。清代医家周学海提出“伏邪皆在膜原”说。他认为人感受四时不正之气，变为伏邪潜伏于体内，附着于“膜原”部位。此膜原为广义之膜原，即伏邪在体内潜伏之所。
三焦为原气之别使主司功能的人体气化巨系统，决定了系统膜原论的功能层次。
Trijiao is the human's giant system of Qi function of essential Qi, deciding the functional level of pleurodiaphragmatic interspace.
胚珠是半球形的，有2个被膜，腱鞘状，而原孢子细胞直接作为大孢子母细胞起作用。
The ovules are hemitropous, with 2 integuments, tenuinucellate and the archesporial cell functions directly as the mega-spore mother cell.
他们从人造“原细胞”着手，这些像真细胞的“人造细胞”外部被一层脂肪膜所包围。
They began by experimenting on artificial "protocells". These, like real cells, were surrounded by membranes made of fatty molecules.
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