She says they were only made for scenery - like the rhinoceros and the mastodon.
她说，瀑布完全是为了点缀风景而存在的，犀牛和乳齿象也是一样。
North American mastodon; in some classifications considered a mammoth rather than a mastodon.
北美洲的乳齿象；在一些分类中被当作猛犸而不是乳齿象。
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。
The rib containing the spear point was part of a collection of mastodon remains unearthed in the late 1970s.
这一含有长矛尖的肋骨来自一批20世纪70年代后期采集出来的乳齿象遗骸。
The researchers also made what they say are the first sequences of nuclear DNA from the extinct American mastodon.
据研究者说，他们还首次完成了已灭绝的美洲乳齿象细胞核DNA序列的测定。
Isn't the mastodon from the Pliocene Epoch?
乳齿象不是上新世的吗？
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。
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。
The man in this picture is holding a mastodon tooth that was found not very long ago.
照片中的人拿著一颗不久前出土的乳齿象牙齿。
The mastodon became extinct about 10, 000 years ago - around the same time that mammoths disappeared from most of their range.
美洲乳齿象在约1万年以前灭绝-几乎在同一时间猛犸象也从大多数它们分布的地方消失了。
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。
The mammoths should not be confused with the American mastodon (Mammut americanum), another ancient elephant from North and Central America.
猛犸应该不会与生活在北美洲和中美洲的另一种古象——美洲乳齿象相混淆（Mammutamericanum）。
The researchers compared sequences of DNA from the nuclei of African and Asian elephants, and from woolly mammoths and the American mastodon.
研究人员对比了非洲象和亚洲象，以及来自猛犸象和美洲乳齿象的细胞核dna序列。
Although mastodon mitochondrial DNA has been sequenced before, the researchers say they were the first to do the analysis on DNA from the cell nucleus - in this case, using material from a tooth.
尽管此前已完成了美洲乳齿象的线粒体dna测序，研究者表示他们还首次实现了对细胞核dna的测序-在本例中使用的材料来自牙齿。
Although mastodon mitochondrial DNA has been sequenced before, the researchers say they were the first to do the analysis on DNA from the cell nucleus - in this case, using material from a tooth.
尽管此前已完成了美洲乳齿象的线粒体dna测序，研究者表示他们还首次实现了对细胞核dna的测序-在本例中使用的材料来自牙齿。
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