Until this week Saturn's small moon Rhea was the only known solid space object thought to have a ring. (Other known ringed bodies, such as Saturn, are mainly gaseous.)

直到本周土星的小卫星土卫五还被认为是唯一具有环的立体空间物体。(其它已知有环的天体，例如土星，大部分是气态的。)

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Design a systematic second-floor pedestrian system, the connection of the solid space should be stated clearly to indicate construction details for lower level.

建立系统有效的二层步行系统，清晰表达立体空间的连接关系，以指导下层次详细工程设计与建设实施。

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The first pictures of Earth taken from space showed a solid ball covered by brown and green landmasses and blue-green oceans.

VOA: special.2011.01.04

They worked for Morton Thiokol (now ATK Thiokol), the Utah-based NASA contractor which produced the solid rocket motors that lifted space shuttles from their launch pads.

NPR: Challenger: Reporting a Disaster's Cold, Hard Facts

It's almost the same mix as in the solid-rocket boosters on the Space Shuttle, and it's powerful stuff.

FORBES: Serious Toys

This is the home of the Patent Records Office, 4, 600 square meters of storage space hewn out of solid rock, the last repository of America's intellectual property.

FORBES: The smother of invention