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These people learned that the way they choose to live at home has far-reaching effects on the planet.

VOA: special.2009.04.22

.091 has a syllabus that is unlike general chemistry taught anywhere else on the planet.

。091的课程大纲与这个地球,其他地方的化学概论课不一样。

麻省理工公开课 - 固态化学导论课程节选

There something happens. He does not know how, but he has been transported to the Red Planet,Mars.

VOA: special.2010.07.17

Our first president was one of the greatest leaders the planet has ever seen.

FORBES: Say Goodbye. And Lead Like George Washington.

Its abundance on Mars suggests that the planet has been cold and dry throughout most of its history.

ECONOMIST: Martian chronicles

The race is now on to detect whether the planet has an atmosphere and whether it contains water.

ECONOMIST: Is there anybody out there?