Although not the only controversial aspect of reform proposals put forward by Democrats and supported by the president, a proposed government-run insurance option as an alternative to plans offered to Americans by private companies has drawn the most attention.

VOA: standard.2009.09.09

This is very easy molecule because we know exactly where to put them without even having to think, we only have one option, and we'll make a triple bond between the carbon and the nitrogen.

这个分子非常简单,因为我们知道应该把它们放在哪里,甚至不用去想，我们只有一个选择，我们将在碳与氮之间形成一个三键。

麻省理工公开课 - 化学原理课程节选

This is very easy molecule because we know exactly where to put them without even having to think, we only have one option, and we'll make a triple bond between the carbon and the nitrogen.

这个分子非常简单,因为我们知道应该把它们放在哪里,甚至不用去想，我们只有一个选择，我们将在碳与氮之间形成一个三键。

麻省理工公开课 - 化学原理课程节选