You can only judge how high something is when you know how far away it is
知道了某物的距离才能判断其高度。
We can find the size of something by means of measurement.
我们可以用测量法求得某物的体积。
It's important to try and make something of your life.
在一生中有所成就是很重要的。
First try to do something that is within your scope.
你先试着做一件自己力所能及的事。
I'm sure she's keeping something back from us.
我肯定她有什么事瞒着我们。