1、 Previously the first indications of mastodon hunting were associated with the ˈClovis cultureˈ 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。
来源:秒词邦搜集整理
2、 Scientists have now accurately carbon-dated the sharp tip that itself carved from mastodon bone.
如今，利用放射性碳素测定年代法，科学家已确定这一用乳齿象牙雕刻而成的长矛尖端的精确年代。
来源:秒词邦搜集整理
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