straight on the point

You wouldn't ordinarily run two CD commands in a row, because the point of changing your working directory is to do some work in it, not to move on to somewhere else straight away.

通常您不会在一行中运行两个cd命令，因为更改工作目录的目的是为了在其中进行一些工作，而不是直接移动到别的地方。

A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.

这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。

I think this whole portion would be fine, so we could take this point as well as this point, because anywhere on this straight line, you will get the same value for Young's modulus.

我认为这个位置可以，所以我选择这个点，以及这个点，因为这条线的任意处，你都会得到相同的，杨氏模量。