Jupiter's moon Io, whose density is 3.5 grams per cubic centimetre, is all rock.

木星的卫星木卫一全是岩石，其密度为每立方厘米3.5克。

《柯林斯英汉双解大词典》

Two sulfurous eruptions are visible on Jupiter's volcanic moon IO in this color composite image from the robotic Galileo spacecraft that orbited Jupiter from 1995 to 2003.

在这张来自伽利略航天器的彩色合成照片中我们可以看到，在木星这颗遍布火山的卫星木卫一上，正发生着两场硫磺喷发。伽利略航天器从1995年至2003年一直环绕着木星运行。

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These moons heat up from the constant stress and stretching; Jupiter’s moon Io is a leading example.

由于空间持续不断的压力以及拉伸作用使得卫星表面温度不断上升，木星卫星就是一个典型的例子。

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The eight regular satellites include four large objects discovered by Galileo and four small objects in circular orbits interior to that of the major volcanic moon Io.

BBC: More moons for Jupiter