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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Many of them are derived from cholesterol and they're hydrophobic, which means they can penetrate through cell membranes.

多数分子都来自于胆固醇,它们是疏水性的,这意味着它们能够穿过细胞膜

耶鲁公开课 - 生物医学工程探索课程节选