jumping是jump的现在分词。
The students entered the classroom ， jumping and singing .学生们又唱又跳地进了教室。
Jumping from that altitude is extremely challenging of course .从这样的高度跳下来是一件非常有挑战性的事情。
Well ， tell that to the guy jumping to his death .好吧，把这些告诉正在跳向死亡的那位工人吧。
The tradition of jumping from the new river gorge bridge dates back to 1980 .这项从新河峡大桥上背死跳的传统始于1980年。
