Many elements of space travel series and films borrow extensively from the conventions of the western genre.

太空旅行系列片和电影从西部片传统里借用了许多元素。

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The hyena's whoop vocalization is a series of discrete calls produced in about of sound that can travel distances of more than two miles.

鬣狗“呜呜”叫声是由一轮发音而形成的一系列不连贯的呼唤，可以传播到两英里以外。

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This post, written by Mitchell, is the first part of a short series introducing some of the mistakes many new travel photographers make.

以下这篇文章就是由Mitchell所写的一系列文章里的最初一篇，指出了一些很多新手旅行摄影师会犯的常见错误。

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He also produced the thirteen-part series, "From the Earth to the Moon" because of his support for human space travel.

VOA: special.2011.06.17

Their stories are part of a new series of conversations about air travel today and how it has changed over time.

NPR: Air Travelers Say Hassles Mount

Last year brought a series of small firebombs outside travel agencies offering trips to Cuba and a club where a controversial Cuban singer was to perform.

ECONOMIST: Cuba

We even took a series of valuable classes on effective travel photography.

FORBES: A Cruise Specialist's "Bucket List" Cruise