生物大分子活动的最终目标常常是化学小分子的代谢。

The ultimate goal of the biological activity of large molecules are often metabolism of small chemical elements.

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人类细胞有将大分子分解成小分子的能力；从而为自身活动释放足够的能量。

Human cells have the ability to break down large molecules to smaller ones to liberate sufficient energy for their activities.

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最近引进的采用双官能抗体和小分子的半抗原的两步法在一定程度上满足了这个要求。

A recently introduced approach satisfies this requirement to some extent: the use of low molecular weight haptens with bifunctional antibodies.

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Steroids are small molecules - much smaller than proteins - smaller molecules that tend to be hydrophobic or lipid soluble.

类固醇是小分子物质,比蛋白质小得多,这类小分子是非水溶性的,或者说是脂溶性的

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So, we need a new kind of mechanics, which is quantum mechanics, which will accurately explain the behavior of molecules on this small scale.

所以我们需要一种新的力学，也就是量子力学,来解释在这个,小尺度下分子的行为。

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It has to be small, and it has to be lipid soluble in order for it to pass through a cell membrane.

这些分子必须非常小,而且必须是脂溶性的,才能穿过细胞膜

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