reference point 托福

In this paper circular uncoded targets and coded targets are used as reference points, and an algorithm of automatic reference point detection is proposed.

文中采用圆形目及编码元素作为，并提出一种自动检测算法。

Ambitious future observers might also send out probes that escape the supergalaxy and could serve as reference points for detecting a possible cosmic expansion.

有企图的未来观测者，或许会发射一些能够脱离系的探测器，做为侦测宇宙膨胀的参考。