第1个回答 2007-01-19
we can skating for a long time without tumble!
第2个回答 2007-01-19
we can skating for a long time but not fall down本回答被提问者采纳
第3个回答 2007-01-19
we can skiing for a long time and not fall dowm
第4个回答 2007-01-19
we can ski for a long time without falling down
第5个回答 2007-01-19
we can skiing for a long time and not fall dowm