Let's listen to John Kander sit on one pitch level and then suddenly raise the whole thing up.

我们听到约翰·肯德尔选择了一个音高,然后突然升高了

耶鲁公开课 - 聆听音乐课程节选

At this point, we have no other choice but to double up before going to the next energy level, 2px so we'll put a second one in the 2 p x.

在这点上我们没有其他选择,而只有双倍填充,在到下一个能级之前，所以我们放入第二个电子至。

麻省理工公开课 - 化学原理课程节选

One, at the first level, what are the cells that make up that tissue?

其一,在第一个层次上,构成那个组织的是哪些细胞呢

耶鲁公开课 - 生物医学工程探索课程节选

Now, to answer that, I'm going to back up one more level.

现在为了回答这个问题，我会退一小步。

麻省理工公开课 - 计算机科学及编程导论课程节选

Sure, there'd be some new particular puzzle you hadn't seen before, but you'd sort of step up a level and say, "Although I haven't seen this particular one before, I've seen crossword puzzles before.

当然肯定有你没见过的特殊填字游戏，但你会退一步说，“虽然我没见过这个特殊的填字游戏，但我见识过填字游戏。

耶鲁公开课 - 死亡课程节选

So that explains why they're so reactive, they're all very willing to give up that one s orbital and then drop to a lower energy level.

这就解释了它们的化学性质为什么非常活泼，它们都很愿意失去那个，s，电子,然后降到更低的能级上去。

麻省理工公开课 - 化学原理课程节选