它们甚至比以往的交通环道（如曼哈顿市区建于上世纪的哥伦布环道）更加高效和安全（现代设计包括使靠近环形路的车辆减速的系统，以及禁止行人进入环形的中心区域）。

(Modern designs include mechanisms for slowing traffic down as it nears the roundabouts, for example, and do not allow pedestrians onto the centre of the circle).

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设置了障碍，使人群无法靠近。

Barricades were erected to keep back the crowds.

《牛津词典》

但是，当它穿过你肘关节的时候，这条神经特别靠近皮肤，使肘关节其成为一个脆弱的部位。

But when it passes through your elbow joint, the nerve is particularly close to the skin-making it a vulnerable target.

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Now if you read in the book, you read about where this figure is shown in the book, you can understand more about why these structures line up in the right way so that the right molecular elements are together to form hydrogen bonding pairs between them.

如果你预习过课本,课本中有关于这些详细的描述,你可以更深刻的理解,为什么这些结构是采用这种连接方式,以使对应的分子部分靠近,并形成氢键连接

耶鲁公开课 - 生物医学工程探索课程节选