音标：['mæstәdɒn] ；

n. 乳齿象

n. extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth

词型变化：名词复数形式 : mastodons

词性分布：

名词100%

【近义词】

mastodont[古生]乳齿象...

美国国家公共电台 NPR New Evidence Suggests Humans Arrived In The Americas Far Earlier Than Thought

ARI SHAPIRO, HOST: Artifacts found in Southern California have puzzled scientists for years. Some now say they are proof that humans lived in the area 130,000 years ago, well before anyone thought. That would make them the oldest evidence of humans i

发表于:2018-12-17 / 阅读(69) / 评论(0)

2017年NPR美国国家公共电台4月

英语听力：探索发现 2013-01-13 冰河新新州 Ice Age Oasis—14

Some of this ice age dung was found beneath the skull in the Aucilla. The dung contained plant remains that tell us what the mastodon was browsing on 13,000 years ago or morea mixture of trees and grasses. This suggests that ice age Florida was drier

发表于:2018-12-27 / 阅读(83) / 评论(0)

探索与发现2013年

美国科学60秒 SSS 2015-02-16

It has long been thought that mammoths and mastodons rambled over North American subartic grounds between 75,000 and 10,000 years ago, and were made extinct by hungry new arrivals on the scene, human beings. But new evidence indicates mastodons proba

发表于:2019-01-20 / 阅读(71) / 评论(0)

2015年Scientific American(二)月

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allosteric proteins (watson)