kē xué jiā / rèn wéi / xiǎo xíng xīng / zhuàng jī / kě néng / yǐn fā / le / dì qiú / lì shǐ shàng / de / yí cì / dà miè jué

科学家认为，小行星撞击可能引发了地球历史上的一次大灭绝。

Scientists believe that an asteroid impact may have triggered one of the mass extinctions in Earth's history.