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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Gathering your resources to "try hard" requires burning energy in order to overcome your currently low arousal level.

调动资源来“努力尝试”，需要消耗精力，以克服目前的低唤醒水平。

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In order to achieve a successful outcome or reward, some level of risk is almost always essential.

为了获得成功的结果或回报，一定程度的风险几乎总是必不可少的。

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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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Their position also requires a strong focus on the day-to-day stuff that needs to happen in order to achieve the high-level objectives.

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Woods, looking for a first major win since the 2008 U.S. Open, slipped down the pecking order after a level-par final round.

CNN: PGA champion McIlroy revels in defying doubters