It is not about measuring the length of something.

它和测量某物的长度无关。

So good luck going out to a coast with a microscope and measuring the length that way.

所以如果你是拿着显微镜去计算海岸线的长度，那祝你好运。

It might seem to you as simple as finding where it starts and where it ends and then just measuring the length in between.

对你来说，这似乎很简单，只要找到它的起点和终点，然后测量两者之间的长度就可以了。

The point is, Earth is constantly evolving. So good luck going out to a coast with a microscope and measuring the length that way.

重点是，地球一直在变化。所以祝你能够顺利地用显微镜测量海岸线长度。

So when you're measuring the length of a river, it's important to not only define where the beginning and end points are but to also define what units of measurement you're actively using.

因此，当你测量一条河流的长度时，重要的是不仅要定义起点和终点的位置，还要定义你正在使用的测量单位。