Earth is just one planet in the universe.
地球只是宇宙中的一颗行星。
We have only one planet a home, a vast land.
我们只有一个地球一个家园，一个辽阔的土地。
We cannot repeat experiments with just one planet.
我们只有一个地球，无法重复进行实验。
The theme of this year’s World Environment Day, “Many Species. One Planet.
今年世界环境日的主题为“众多物种·同一个星球·同一个未来”。
“Having only one planet makes this a rather significant problem, ” says Gilding.
“然而我们只有一个地球，这使得问题更加明朗化，”吉尔丁这样说道。
It is one planet, one place, and there is nothing else like it anywhere in the solar system.
这是一个星球、一个居民区，是太阳系中一个独特的地方。
Scientists calculate that in order for one planet to be able to support intelligent life.
科学家计算出，要使一个星球能保有高等智慧生物的存在。
On one star, one planet, my planet, the Earth, there was a little prince to be comforted.
在一颗星球上，在一颗行星上，在我的行星上，在地球上有一个小王子需要安慰！
They found that about 40% of such stars have at least one planet less massive than Saturn.
他们发现，这类恒星中，大约有40%至少有一颗行星质量没有土星的大。
It's not about defining what culture you're from - we are all human beings on the one planet.
这并不是定义你从何而来的文化。我们在同一颗星球上的人类！
BFF have analysed the potential offered by ZED products for 'one planet living 'within the UK.
BFF为英国的‘一颗星生活空间’分析了ZED产品的潜能。
But when more than one planet is tugging at a star, deciphering the meaning of the wobble is complicated.
但是，多个行星牵引一个恒星，解密星体移位的内涵就会复杂化。
All the people in the world must help China, and not simply criticize it. After all, we only have one planet.
全世界的人都应该来帮助而不是单纯指责中国，毕竟我们只有一个地球。
Mars hasn't been in this house in two years, and Mars is the one planet you need to make significant progress.
火星不在家庭宫里已经两年了，而且火星是一个使你有重大进步的行星。
One planet, about the size of Mars, probably had an orbit which crosses Earth's, and eventually a collision occurred.
一个大小与火星相当，轨道可能与地球轨道交叉的行星，最终与地球发生了碰撞。
That is probably not because most solar systems contain only one planet, but rather because it is hard to spot several at once.
其中的原因可能并不是由于多数的类太阳系仅包含一颗行星，而这是因为在同一时间很难发现多颗的行星。
On one star, one planet, my planet, the Earth, there was a little prince to be comforted, I took him in my arms and rocked him. I said to him.
在地球上，在我的行星上，有一位需要安慰的小王子。
Eventually, one planet loses the battle and winds up in the nether regions of its solar system or kicked out of the parent star's orbital nest entirely.
最终会导致其中一个行星输掉这场较量，失去在这个星系中存在的资格，或者被完全开除出绕恒星运行的轨道。
However, as one planet exists around this star, it is possible that others will be discovered — perhaps in more habitable orbits — as observations continue.
但是，既然恒星周围存在一颗行星，那随着观测的进展，很可能会发现其他的行星——也许位于更适宜居住的轨道上。
With his 20-power telescope and with his eyes in bad shape he might have mistaken Saturn's gaseous ring to surmise that it was formed of one planet with two moons as satellites.
由于伽利略用的是20倍的望远镜，而且他眼睛的状况也很糟糕，他很可能把土星的气环搞错了，并因此得出结论-土星是由一个行星和两个卫星组成的。
The planet is one of 119 known extra-solar planets, objects that orbit stars other than the sun.
这是119颗太阳系外行星中的一颗。这些行星围绕除太阳外的其他星体运行。
The rover should have at least one Martian year, to roam the planet, during which time it will collect, grind and analyze around 70 samples of rock and soil.
流浪者至少要待一个火星年，去漫步这个星球，在这期间，它将收集、研磨和分析大约70个岩石和土壤样本。
Boss said it is possible, even likely, that most stars have at least one earth like planet, which he considers surprising.
博斯说，大多数恒星都有可能，甚至很有可能，至少有一颗类似地球的行星，他认为这是令人惊讶的。
The fact that we now imagine our planet as a whole does not mean that the "rescue" of our planet will come with one big global stroke of genius and technology.
事实上，我们现在认为所在的星球是一个整体，这并不意味着对我们星球的“拯救”能靠着一次全球性的天才之举和技术就能实现。
It was about 6, 500 kilometers long and went across one fourth of the planet.
它大约有6500公里长，覆盖了地球的四分之一。
Do you know that one-fifth of the planet speaks Chinese?
你知道地球上有五分之一的人说中文吗？
From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.
从火星熔岩流上出现的少量陨石坑中，我们可以估计，在5亿年前，这个星球上的火山还很活跃——也许现在依然活跃。
One way we keep track of the radiation budget is by looking at the albedo of the different surfaces on the planet.
我们记录辐射收支的一种方法是观察地球上不同表面的反照率。
One way we keep track of the radiation budget is by looking at the albedo of the different surfaces on the planet.
我们记录辐射收支的一种方法是观察地球上不同表面的反照率。
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