寻找自然的框架，比如一个拱形或峡谷涯壁的阴影。一个框架可以是一个戏剧性的装置来突出你的主题。

Look for natural frames, such as an arch or the shaded walls of a canyon. A frame can be a dramatic device to enhance your subject.

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原因如下：1830年，一位名叫乔治·兰金（George Rankin）的当地官员用一根绳子把自己吊入洞穴，这根绳子固定在洞穴壁的一个突出石块上。

Here's why: In 1830 a local official named George Rankin lowered himself into the cave on a rope tied to a protrusion in the cave wall.

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心壁的最外层也是心外膜的最内层。

The outermost layer of the wall of the heart is also the innermost layer of the visceral pericardium.

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And if the distance between the wall and the dam was large in comparison to the wavelength then what happens?

如果水槽壁,和屏障之间的距离,大于波长,会导致什么？

麻省理工公开课 - 固态化学导论课程节选

There's no heat that can go through the walls of the thermos.

没有热量能,穿过热水瓶的瓶壁。

麻省理工公开课 - 热力学与动力学课程节选

This property of cells in culture is called anchorage dependence - that the cell needs to be anchored to a surface in order to function properly.

体外培养细胞的这种特性,称为贴壁依赖性--,意思是细胞必须固定在,某个表面上才能正常生长

耶鲁公开课 - 生物医学工程探索课程节选