1·It's from meteoroids that we get meteors and meteorites.
我们从流星体中得到流星和陨石。
2·Stone meteorites, which we refer to simply as stones, are almost entirely rock material.
我们简单地称之为“石头”的石头陨石，我们简单地称之为石头，几乎完全是由岩石组成的。
3·Ir is found in high concentrations in some meteorites, in which the solar system's original chemical composition is preserved.
人们发现，在一些保存着太阳系原始化学成分的陨石中，铱元素的含量很高。
4·Iridium occurs in meteorites and volcanic material, but in the latter case it is accompanied by elevated levels of nickel and chromium.
铱存在于陨石和火山物质中，但在火山物质中同时包含高浓度的镍和铬。
5·There is increasing evidence that the impacts of meteorites have had important effects on Earth, particularly in the field of biological evolution.
越来越多的证据表明，陨石的撞击对地球产生了重要的影响，特别是在生物进化领域。
1·The previous five extinctions were visited upon the dinosaurs and other denizens of the earth by the natural world, coming as glaciers, meteorites, or volcanoes.
自然界将前五次灭绝带给了恐龙和地球上的其它居民，它们以冰河、陨星或火山的形式到来。
2·Krypton in today's atmosphere is somewhat heavier than solar krypton, and the krypton embedded in meteorites known as carbonaceous chondrites is even heavier than that.
氪在今天的大气层中比太阳能的氪更重一些，这些氪比埋入了陨星，也就是通常熟知的碳质球粒状陨石中的氪还有重很多。
3·These have been associated with iron meteorites, are usually reddish and thought to be fragments of the cores of much larger objects.
与铁陨星存在许多联系，后者通常呈淡红色，被认为是更大星体的核碎片。
4·But Dr Nield's most surprising revelation of all is that, far from being agents of death, meteorites might, in fact, be harbingers of life.
但是Nield博士最令人惊奇之处在于，他揭示出陨星并非死神之降临，而是生命之先兆。
5·Meteorites can contain thousands of organic molecules, including amino acids.
陨星可蕴含成千上万的有机分子，包括氨基酸。