介绍你认识三和木，他最近刚到美国上大学。
Meet Mitsuaki. He recently arrived in the United States to enter university.
当三和木刚抵达美国时，他很惊讶美国许多开车的人年纪实在很轻。
When Mitsuaki first arrived, he was amazed at how young many American drivers there were.
但最新的引力数据却显示，泰坦星和木卫三经历了完全不同的演化历史。
But the new gravity data suggest that Titan and Ganymede had very different evolutionary histories.
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