distance indicators造句

• Each one has its advantages and disadvantages . both of them are called the distance indicators
  基本上这两种量度星系距离的方法有各自的优缺点，无论如何，它们都是天文学家不可或缺的
• We have to use quite a few distance indicators because there is no single one that can measure all the distances . this is the
  利用已知而可靠量度近距离天体的量天尺，去校准量度更远距离天体的量天尺，是科学家常用的惯技。
• This usually means that we find out the relation using stars near us , then apply the relation to greater distances . in general , we use accurately determined distance indicators for small distance to calibrate distance indicators for greater distances
  事实上，科学家首先找一些离我们较近的造父变星，找出它们的光变周期与光度的关系，然后假设这个关系对遥远的同类变星依然适用。