Two men riding on motorcycles opened fire on him.

　　兩個(gè)騎在摩托車上的人向他開了槍。

　　Perhaps this riding lark would be more fun than she'd thought.

　　也許這次騎馬的無聊活動比她所想象的要好玩一些。

　　The area is well suited to road cycling as well as off-road riding.

　　這個(gè)地區(qū)很適合公路自行車競賽和越野騎馬。

　　Riding is her favorite occupation.

　　騎馬是她最喜歡的娛樂活動。