The first major moon you come into is Io, which is this very active place.

你第一个来到的主要的卫星是爱莪(木卫一)，是个非常活跃的地方。

Zeus then turned Io into a beautiful white little cow to avoid Hera.

为了躲避赫拉，宙把爱娥变成了一头漂亮的小白牛。

Being a very jealous woman, Hera was so angry that she wanted to revenge Io.

赫拉是一个嫉妒心很重的女人，她非常生气，想要报复爱娥。

Unlike the volcanoes on Earth, Io erupts plumes of sulfur.

不像地球上的火，木卫一上的火的是硫磺。

In order to save Io from the monster, Zeus sent Hermes to kill him.

为了救出爱娥, 宙派赫尔墨去杀掉阿古。

Io is one of Jupiter's moons.

Io 是木星的一个卫星。

Io, for example, has an elliptical orbit.

例木卫一 ，有一个椭圆形轨道。

One of them would explore Jupiter's moon Io and one of them would fly by Neptune's moon Triton.

另外的一个将探索木卫艾奥，还有一个将飞到海王星的卫星崔顿上。

When the Voyager 1 space probe passed Io in 1979 it revealed a surface that was really weird.

当旅行者1号太空探测器在1979年经过木卫一时，揭示了一个非常奇特的地表。

The surfaces of the moon, Mars, Mercury, Venus, and even Jupiter's angry little moon Io are all overwhelmingly volcanic.

月球、火星、水星、金星，甚至木星愤怒的小卫星木卫一的表面都有大量的火。

Then Io, still in the form of a cow, was set free.

爱娥自由了，但她仍然是牛的样子。

See, depending on the time of year, Io emerged later than expected, or earlier than expected.

随着一年中时间的不同，伊娥有时会出现得稍晚，有时会出现得略早。

The four largest moons, Io, Europa, Ganymede, and Callisto, are large enough to be seen from Earth with a telescope.

从地球上就可以用望远镜看到最大的四颗卫星，木卫一，木卫二，木卫三，木卫四。

So here's the Solar System, there's the sun, there's the Earth, here's Jupiter, and here is Jupiter's innermost moon, Io.

我们拿石头打比方，这个是太阳，这是地球，这是木星，这个是离它最近的卫星伊娥(即木卫一)。

Romer noticed that Io then emerged later than it was expected to.

罗默现那时的伊娥就会姗姗来迟。

Oh, one more thing: both Ganymede and Io are magnetically connected to Jupiter.

木卫三和木卫一都通过磁场与木星联结。

Ron took it off it and the owl departed at once, leaving inky footprints across Ron's drawing of the moon Io.

罗恩把信解了下来，猫头鹰立刻就飞走了，在罗恩画的木卫一上留下沾着墨水的脚印。

Now, Romer's genius was to realise that had nothing to do at all with the orbit of Io around Jupiter.

罗默的天才就在于他意识到这个误差并非来自伊娥绕木星运转的轨道。

Each time Ganymede completes one orbit, Europa completes two, and Io four.

每次木卫三完成一圈轨道运行时，木卫二会完成两圈，而木卫一则会完成四圈。

This is because Io, Europa, and Ganymede are all in orbital resonance.

这是因为木卫一、欧罗巴和盖尼米得之间存在轨道共振。