That's the lesson I try to remind myself of every day; we have an equal vote with all these other species on this planet."

VOA: standard.2010.08.04

Earlier this summer I was at a smelter in Japan, the largest titanium smelter on the planet.

早在这个夏天我去了日本一家熔炼厂，那是全世界最大的熔炼厂。

麻省理工公开课 - 固态化学导论课程节选

My bid concern is that you have this huge group of people on the planet 2 young people between ages of say 12 and 19 or 21 or 22 all asking the question: Who am I?

我最关注的是,我们在世界上拥有如此巨大的一个群体,即年龄介于12到19岁，或者21，22岁的青年人2,都在问一个问题：,我是谁？

普林斯顿公开课 - 人性课程节选

"The bulk of our food production on this planet is dependent to some extent or another on oil or products of oil, so this goes right to the heart of,frankly, the way our society functions,"

VOA: standard.2009.10.20

And so, when you think about how much cement concrete are consumed annually on the planet, this becomes a considerable point source of greenhouse gas emissions.

当你想到,在地球上每年要消耗多少的水泥混凝土的时候,这将是温室气体排放的,一个主要来源。

麻省理工公开课 - 固态化学导论课程节选

He lists three essentials for life on this tough new planet: food,energy and the Internet.

VOA: standard.2010.04.21

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

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