Given a sequence of binary trees, you are to write a program that prints a level-order traversal of each tree.

给定一个二叉树序列，你要写一个程序将每棵树按层序访问并打印出来。

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Specifically, we have to take in this exact amount of energy in order to bump the electron up to higher energy level.

特别的，我们严格需要,这么多,来把电子，提升到更高的能级。

麻省理工公开课 - 化学原理课程节选

Sometimes it takes 4 or 5 years in order to get some level of competency.

有时候它需要4到5年才能达到一定的水平，

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And so we are going to use that in order to construct some energy level diagrams.

我们就准备使用它,来建立一些能级图。

麻省理工公开课 - 固态化学导论课程节选

In accordance with state tax laws, the total selling price of an item will generally include item-level shipping and handling charges, item-level discounts, gift-wrap charges, and an allocation of order-level shipping and handling charges and order-level discounts.

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Greater democracy at the European level in order to control the budgets of the member states.

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Banks must hold a higher buffer of capital to a certain level in order to keep to European rules.

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