星期一早上我们上数学和语文课。
我们上数学、英语和音乐课。
我们上数学,英语和历史课。
So, what we are going to study now is a non-living object and we're going to pick it to be a mathematical point.
我们现在所要研究的的,是一个没有生命的物体,我们要把它看作一个数学上的点
We don't have requirements. We don't have to take math, that's the reason I applied to Brown,
我们没有什么硬性要求。我们不用上数学课,这是我选择布朗大学的原因,
He was trying to describe electrons, but the theory said there are two roots in the quadratic equation and the second root is mathematically as interesting as the first one.
他当时只是想去描述电子,但是数学理论告诉我们,二次方程有两个根,而第二个根在数学上和第一个根一样有趣
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