Titan was a major focus of the mission all along, since it's bigger than the planet Mercury and the only moon massive enough to have a significant atmosphere.

土卫六一直以来都是这项探测任务的主要聚焦点，因其体积比水星还要大，是唯一一颗拥有浓密大气层的卫星。

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Finally, planetary scientists are eager to learn where Titan's nitrogen and methane originated and why it is the only moon in the solar system that possesses a dense atmosphere.

最后，行星科学家急于了解土卫六的氮气及甲烷从何而来，又为什么只有它是太阳系唯一拥有浓密大气的卫星。

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It is the only moon of any planet which has its own atmosphere.

TITAN是所有行星的卫星中唯一有自己的大气层的卫星。

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Yet it seemed to those seeking to solve the longitude problem that the only solution was in the moon and stars.

VOA: special.2010.07.14

It was Galileo's job, you'll remember, with his telescope to detect the otherwise undetectable spots and imperfections in this seemingly, but only seemingly, perfect moon.

你们还记得，通过望远镜，观测到这个看起来，却只是看起来完美无缺的,月亮上的黑点和缺陷，是伽利略要做的。

耶鲁公开课 - 弥尔顿课程节选

The Moon Mineralogy Mapper could only examine lunar soil to a depth of a few millimeters.

VOA: special.2009.12.30

Weather of a slightly more familiar kind is thought to exist on Titan, the largest satellite of Saturn and the only moon in the solar system to have a thick atmosphere.

ECONOMIST: Comparative meteorology

"Remember this moment, " announced guide Andy Richards, as we sat in the darkness, lit only by the full moon above and the glow sticks adorning our bodies.

BBC: Moonwalk in Sydney's Royal National Park

People in a much larger region of the world can anticipate seeing a partial solar eclipse, in which the moon blocks only a fraction of the sun's disk.

CNN: Africa awaits total eclipse of the sun