自从欧洲人首次发现澳洲，人们就在尝试了解由土著居民，即这片大陆的原始居民，创作的古代岩画和雕刻品。

Ever since European first explored Australia, people have been trying to understand the ancient rock drawings and cavings created by the Aborigines, the original inhabitants of the continent.

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我们很确定在早些时候，马就在西北地区，即现在的乌克兰和俄罗斯西部被驯养。

We are pretty sure that horses were first domesticated a bit earlier, to the northwest, in the area that is now Ukraine and western Russia.

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如果看了迈克的照片，特别是这张他接受手术前的照片，就在他接受手术的时候，即他大约30岁左右时，他还在从事高山滑雪。

If you see the pictures of Mike, especially here well before he had his surgery at the time he was about 30 skiing downhill.

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If you see the pictures of Mike, especially here well before he had his surgery at the time he was about 30 skiing downhill.

如果看了迈克的照片，特别是这张他接受手术前的照片,就在他接受手术的时候，即他大约30岁左右时，他还在从事高山滑雪。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

If every time I get the same acceleration, I'm convinced this is a reliable spring that is somehow producing the same force under the same condition.

如果每次都能得到相同的加速度,这个弹簧的可靠性就能令人信服,即它在相同的条件下能够产生相等的力

耶鲁公开课 - 基础物理课程节选

and the illusion was that they didn't see what is right in front of their very eyes, which is the potential inherent in every single student.

幻象是他们看不到,就在他们眼前的东西，即每个学生都有潜力。

哈佛公开课 - 幸福课课程节选