This photo essay highlights some of the key health issues related to urbanization and five WHO-recommended, calls to action to build a healthy and safe urban environment.

本照片故事阐述与城市化有关的主要卫生问题以及世卫组织为创建安全可靠和有益健康的城市环境提出的五项行动建议。

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Chapter summaries are useful because they can help you recall a key event or character that you need to include in an essay or a book report.

章节概述非常有用，因为章节概述可以帮助你回忆起论文或读书报告中需要用到的重要事件或关键人物。

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This is another key point of this essay.

这是本论文的另一个重点。

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Huckabee did not participate in our survey, though he did provide us with a short essay on his key positions.

FORBES: Mike Huckabee

Biden did not participate in our survey, though he did provide us with a short essay on his key positions.

FORBES: Joe Biden

Bill Richardson did not participate in our survey, though he did provide us with a short essay on his key positions.

FORBES: Bill Richardson