Radial velocity
[化] 径向速度
🧩 词语组成解析
🗣️ 情景例句
Would you like to see them?
要不要看一看？
Shall we take a break?
我们是否应该休息一下？
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.
然而，在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。