浮游植物由于吸收阳光，有助于保持海洋表面相对温暖。

By absorbing sunlight, the floating plants help keep the ocean surface relatively warm.

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太阳黑子是太阳表面相对较冷较暗的，大致呈圆形的区域。

Sunspots are relatively cool, dark features on the sun's surface that are often roughly circular.

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那些地方照不到太阳也和表面相隔绝，不过显然有些生命没这两样也过得挺好。

These locations lack sunlight and access to the surface—but apparently some kinds of life do nicely without either.

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So, it doesn't need to bind to a receptor on the surface of the cell in order to work because the molecule can actually enter the cell directly.

所以无需与细胞表面受体相结合来起效,因为这些分子能直接进入细胞

耶鲁公开课 - 生物医学工程探索课程节选