climb的过去式形式

　　As they climbed higher, the air became cooler.

　　他们攀登得越高，空气就变得越凉爽。

　　She couldn't visualize climbing the mountain.

　　她想象不出如何攀登这座大山。

　　I like camping, climbing and that sort of thing.

　　我喜欢露营、爬山之类的活动。