单行线上任何车辆不得逆行。

No vehicles are permitted to go the wrong way down a one way street.

上周四最大的小行星“谷神”从南鱼座中逆行而上。

Last Thursday, the largest of the dwarf planets Ceres rose from Piscis Australis, travelling in retrograde motion.

其实行星并没有逆行。

Actually, planets do not travel in retrograde motion.