1·The researchers say they have also done the first nuclear genetic analysis of the American mastodon.
研究人员说他们已经完成了首个美洲乳齿象的细胞核遗传学分析。
2·Previously the first indications of mastodon hunting were associated with the 'Clovis culture' which emerged some 1, 000 years later.
先前，第一个狩猎乳齿象的迹象与晚出现1000年的克劳维斯文明联系在一起。
3·The ancestors of American Indians probably knew the mastodon.
美洲印第安人的祖先大概知道乳齿象。
4·One of the animals whose bones archeologists study is the mastodon.
他们研究的动物骨骸之一，就是乳齿象。
5·Isn't the mastodon from the Pliocene Epoch?
乳齿象不是上新世的吗？