ridingabicycle是什么意思

　　If you travel, try to avoid riding a bicycle.

　　如果出行尽量避免骑自行车。

　　Riding a bicycle again? How long will you insist?

　　又在骑单车啦?要坚持多久啊?。

　　This time he had no truck; he was riding a bicycle!

　　这回他没有开车，而是骑着辆自行车！

　　She had her foot hurt while riding a bicycle yesterday.

　　昨天在骑自行车的时候她的.脚受伤了。

　　When did you see him riding a bicycle on the playground?

　　你何时看到他在操场上骑自行车的？