climb的过去式是什么

解释为爬出、爬升、爬行。例如：

the old lady climbed up the stairs with difficulty.

这位老太婆艰难地爬上楼梯。

the road climbed steeply.

这条公路的上坡很陡。

the children climbed into the school bus.

孩子们登上校车。