1·It spread slowly from college to college before arriving at the railway station, whence it zoomed up and down the land in the trains' slipstreams.
在它到达火车站之前，它慢慢地从一个学院蔓延到另一个学院。到达之后，在火车的高速气流中，它迅速地占据了上上下下的地盘。