And then our mothers tell us, Careful you don't fall down, because you'll fall over. 然后母亲告诉我们，没有跌倒也要小心，因为你还会掉下来。 Now, go into the real atmosphere of this planet. 现在，进入这个行星真正的大气层。 This planet h

Now, I'm an ethnobotanist. 我是名民族植物学家。 That's a scientist who works in the rainforest to document how people use local plants. 我在热带雨林工作，记录人们如何使用当地植物。 I've been doing this for a long time,an

Barbara Jordan: 1976 Democratic National Convention Keynote Address "Who, then, will speak for the common good?" Thank you ladies and gentlemen for a very warm reception. It was one hundred and forty-

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