Dione was one of four Saturnian moons discovered in 1684 by Giovanni Domenico Cassini, who the spacecraft is named after.
1684年，乔瓦尼·多米尼克·卡西尼(Giovanni Domenico Cassini)发现了土星的四颗卫星，土卫四正是其中之一，卡西尼号探测器就是以他的名字命名的。
When the 17th century astronomer Giovanni Domenico Cassini stared through a telescope at mighty Saturn, he knew he had found his life's great work.
在借助望远镜观察奇妙壮观的土星时，17世纪的天文学家乔凡尼·多美尼科·卡西尼知道他找到了一项可以为之付出毕生努力的伟大事业。
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