She found out about the volcanic activity that has shaped the surface of Mars.

VOA: special.2010.07.28

It does so because there are some molecules in the surface of the membrane that allow glucose to move in and out.

而这个过程的完成依赖于,膜表面存在的一些分子,这些分子能够将葡萄糖运进或者运出细胞

耶鲁公开课 - 生物医学工程探索课程节选

The reason you have to get it out of your head is you need to be able to see it on a surface that is not in your mind.

这么做的原因是,你需要,客观地观察它,而不是看它在你大脑中的样子。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

When she looked out to sea, the surface of the water looked strange.

VOA: special.2009.03.17

It is a protrusion of the cell sticking out of the epic al surface.

伸出细胞的美丽表面。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

As you can imagine, the deeper the earthquake goes, the more of the energy is attenuated or spread out as it goes toward the surface.

VOA: standard.2010.01.13

It turns out the electrical potential or electricity that you can measure on the surface of the body reflects things that are happening deeper inside like the beating of your heart.

人们已经证明在体表测量得到的电势能,或者电信号,能够表征,像心跳这样,身体较深处的变化

耶鲁公开课 - 生物医学工程探索课程节选