对保存在火山灰中的人类足迹进行年代测定后，一个科学家小组得出了这一具有争议性的结论。这些火山灰是在墨西哥一个废弃的采石场被发现的。
A team of scientists came to this controversial conclusion by dating human footprints preserved by volcanic ash in an abandoned quarry in Mexico.
就算是在亚里士多德的年代，奴役已经是争议性的制度，且引起了，十分不同的意见与响应。
Even in Aristotle's time, it appears slavery was a controversial institution and elicited very different kinds of opinions and responses.
超文本即是科技这个具争议性的观念始于四十年代。
Arguably, the whole concept of hypertext-as-technology really started back in the forties.
超文本即是科技这个具争议性的观念始于四十年代。
Arguably, the whole concept of hypertext-as-technology really started back in the forties.
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