土卫四

Tidal heating, such as from the resonance with Dione or from libration, would then have sustained these hot spots in the core until the present, and would power the current geological activity.

潮汐热如从与土卫四或天平共振，便拥有持续的核心，这些到现在的热点，并将权力现有的地质活动。

European Cassini spacecraft flew within 310 miles (500 kilometers) of the Dione's pale surface last week, showing it possessed a heavily cratered surface but no presence of an atmosphere.

上周美国－欧洲的卡西尼太空船飞离土卫四的苍白色表面310英里（500公里），显示它的表面有一个巨大的坑，并且没有大气的存在。

For example, Saturn's E ring reaches across a broad region that encompasses the satellites Mimas, Tethys , Dione and Rhea, peaking in brightness at the orbit of the smooth, icy moon Enceladus.

例如，土星的E环所跨过的一大片区域中，包含了土卫一、卫三、卫四与土卫五等卫星，亮度的最高峰就处于平滑冰冷的土卫二之轨道上。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。