The primary difference between reverse osmosis and ultrafiltration or microfiltration is the size of molecules that can pass through the membrane.

反渗透、超滤、微滤之间的基本差别就在于通过膜的分子的大小。

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Fully explicating the complex interplay among these enzymes and the molecules they manage has been a primary goal for scientists seeking to understand the mechanisms governing gene control.

充分阐明这些酶和它们管理的蛋白分子间复杂的相互作用已成为科学家们了解基因调控机制的首要目标。

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Glutathione (GSH), a primary antioxidant, plays an important role in protecting reactive molecules in living cells against oxidative damage.

谷胱甘肽(GSH)是主要的抗氧化剂同时对活性氧分子的解毒起到重要作用。

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The primary difference between bitumen and ordinary crude is the size of the hydrocarbon molecules: in liquid oil, these molecules contain between five and twenty carbon atoms, while in bitumen they contain more than twenty. (At room temperature, pure bitumen is so viscous that it will not flow.) The main job of the upgrader is to break down the oversized hydrocarbons into smaller units.

NEWYORKER: Unconventional Crude