也就是我在此平面上有一个参数曲线，所以问题就是，在任意给定时刻会发生什么呢？
So, I will have some parametric curve that lives on this surface so, the question is, what's going to happen at any given time?
我们在宇宙中是以一些特定时刻来起始的，没有封闭的时间型曲线。
Let's say we start in a universe that, at some particular moment, has no closed timelike curves.
线性需求曲线反映了特定时期某商品需求量与价格之间的关系。
The linear demand curve has reflected the relation between some commodity demand volume and price of specific period.
应用推荐