佛教语。一般指无生死浊恶的净土和有生死浊恶的秽土。 宋 延寿 《宗镜录》卷八九：“浄秽二土，四句分别。一质不成浄秽亏盈，异质不成一理齐平，无质不成缘起万形，有质不成搜原即冥。” 宋 苏轼 《次韵定慧钦长老见寄》之八：“初无往来相，二土同一在。”
科学家们认为土卫二冰火山的活跃时间只占其寿命时间的1%到20%，幸运的是，卡西尼号飞越土卫二的时候正好赶上了喷发期。
Scientists believe the cryovolcanism on Enceladus has only been active during 1 to 20 percent of its existence. We’re glad Cassini caught it in an eruptive phase.
从土卫二号北半球的这个角度来看，大型坑洞以及坑洞地带是非常罕见的。
Craters and cratered terrains are rare in this view of the southern region of the moon's Saturn-facing hemisphere.
据科学家推测，土卫二冰冷的表面99%被水冰覆盖，地表之下存在液态水的几率也很大。
The surface of the icy moon is thought to be about 99 percent water ice, with a good chance of liquid water beneath.
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