By identifying most of these asteroids, and plotting their bits, astronomers insist, they could predict many years in advance if any were destined to strike earth.
通过辨析大部分小行星，研究它们的碎片，天文学家们坚信，一旦有小行星要撞击地球时，他们可提前许多年作出预测。
By identifying most of these asteroids, and plotting their bits, astronomers insist, they could predict many years in advance if any were destined to strike earth.
通过辨析大部分小行星，研究它们的碎片，天文学家们坚信，一旦有小行星要撞击地球时，他们可提前许多年作出预测。
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