Also left forever on the moon is a sign with these words: "Here men from the planet Earth first set foot on the Moon July,nineteen sixty-nine A.D.

VOA: special.2009.07.15

Yes. This cannot depend on the planet Earth.

没错,这个问题不能依赖于地球

耶鲁公开课 - 基础物理课程节选

"And half of the people on planet Earth every day use wood or biomass for cooking.

VOA: special.2010.02.01

Water exists on Earth and the planet Mars.

VOA: special.2009.09.30

He called the planet "Spaceship Earth."

VOA: special.2010.05.30

On the the 40th anniversary of Earth Day, this warming planet we live on is posing serious new challenges to human civilization: increasingly severe droughts, floods,and storms across the globe, and slowly rising ocean levels.

VOA: standard.2010.04.21