The first Earth Summit was held in Sweden in 1972.
第一次地球峰会于1972年在瑞典举行。
When do you think we'll see the first Earth-like planet?
你认为我们什么时候可以看到第一课类地行星？
Interviewee: Her work helped to produce the first Earth Day.
采访对象：她的著作帮助成立了第一个地球日。
Structurally they were similar to the first Earth satellite PS-1.
它们与首颗地球卫星PS-1有着类似的结构。
They are to attempt to be the first to circle the Earth non-stop by balloon.
他们将试图成为首批乘热气球不间断环球飞行的人。
It was the first time that Clara had ever rested on the dry, warm earth.
这是克拉拉第一次坐在干燥而温暖的土地上休息。
We all want to help Earth,because it's our first home.
我们都想帮助地球，因为它是我们的第一个家。
We all want to help Earth, because it's our first home.
我们都想帮助地球，因为它是我们的第一个家。
Earth would thus have its first offspring, seeded by spaceship.
地球将首次拥有子嗣，通过宇宙飞船来播撒希望之种。
It is not, however, the first to get a long-distance shot of Earth.
然而它并不是第一个在长距离拍摄地球的飞船。
This is the first image ever taken of Earth from the surface of a planet beyond the Moon.
这是除月球之外，第一个从其它星球的陆地上拍摄地球的照片。
Thisphoto was the world's first view of Earth taken near the moon.
这是世界上第一张在月球附近看到地球照片。
To answer that question we must first understand some things about the earth itself.
要回答这个问题，必须首先要了解关于地球自身的某些事物。
First, ensure that you have not crash landed on Earth.
首先，确认你是否迫降在地球上。
However, first you must complete your journey upon Earth, and so little time remains.
然而，首先你们必须完成你们在地球上的旅程，还剩下如此少的时间。
However, scientists believe they were not the first animals on Earth.
然而，科学家们相信他们不是地球上第一种动物。
The universe family thinks, your earth humans first to develop a culture education outline.
宇宙大家庭认为，你们地球人类首先要制定出一个文化教育大纲。
When was china's first man-made earth satellite launched?
中国的第一颗人造地球卫星是什么时候发射的？
But, why come to Earth in the first place?
但是，首先为什么要到地球来呢？
Its first function is to provide a route to earth for the heater relay.
第一个功能是提供一个接地路线给加热器继电器。
Look at this spaceship. lt's our first spaceship. l flew to the earth in it a long time ago.
看这艘宇宙飞船。它是我们的第一艘宇宙飞船。很久以前，我乘着它飞到地球。
That, they speculate, was the first step on the pathway to life on Earth.
他们推测，是通向地球上生命的第一步路径。
Scientists on Earth first confirm existence of the subspace domain.
地球科学家首次确认子空间的存在。
Who were the first people to leave the Earth?
第一个离开地球的人是谁？
But first, new scientific details about how the Earth is changing.
不过首先，让我们了解下有关地球变化的最新科学信息。
First, let's look at the map of the world and learn about the earth.
首先，让我们看着这幅世界地图，了解一下地球。
On February 20, 1962, Glenn became the first American to orbit the Earth.
1962年2月20日，格伦成为首位进入地球轨道的美国人。
On February 20, 1962, Glenn became the first American to orbit the Earth.
1962年2月20日，格伦成为首位进入地球轨道的美国人。
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