But it has been luckier than vesta-and almost every other asteroid-in avoiding collisions, and has thus not yielded a huge crop of meteorites for Earth-bound scientists to examine.
但在避免碰撞方面，它比灶神星要幸运得多——几乎比其它任何小行星也都幸运，因此它没有产生可供地球科学家研究的大量陨石。
Their model is the first to include not just collisions between Pluto-sized bodies, but the tiny dust grains as well.
他们的模型不但将冥王星大小的物体之间发生的碰撞包括在内，而且还囊括了微小的尘埃颗粒，这在历史上尚属首次。
Life is a series of collisions with the future; it is not the sum of what we have been, but what we yearn to be.
生活就是一系列与未来之间的碰撞；它不是我们过去曾经是什么的总和，而是我们将来想要成为什么的总和。
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