美洲巨型动物的消失——猛犸象、剑齿猫、巨型树懒等等——发生在人类出现后不久，大约在一万三千年前。
The disappearance of megafauna in America—mammoths, saber-toothed cats, giant sloths, among others—happened relatively soon after the arrival of human beings, about 13,000 years ago.
在北美洲生活着各种各样的巨兽，如猛犸象和乳齿象，都是长着巨大象牙的象状动物，还有骆驼和巨大的树懒，名单待续。
North America was populated by a wide variety of great beasts, like mammoth and mastodons, both elephant-like creatures with big tusks, and camels, giant sloths, the list goes on.
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。
The researchers compared sequences of DNA from the nuclei of African and Asian elephants, and from woolly mammoths and the American mastodon.
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 mammoths should not be confused with the American mastodon (Mammut americanum), another ancient elephant from North and Central America.
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。
The mastodon became extinct about 10, 000 years ago - around the same time that mammoths disappeared from most of their range.
北美洲的乳齿象；在一些分类中被当作猛犸而不是乳齿象。
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。
North American mastodon; in some classifications considered a mammoth rather than a mastodon.
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