是动词ride，意思是骑车的现在分词，表示持续的状态，例如：

1、He was riding on a large black horse.他骑在一匹高大的黑马上。

2、How often do you go riding?你多长时间骑一次马

3、Schools are riding a wave of renewed public interest.各校重新受益于公众的关注。