实战口语情景对话 第528期:Bike Care 自行车保养

重点讲解：
1. by design
有意地；故意地；蓄意地；
eg. The house caught fire by design rather than by accident.
房子起火是蓄意而非偶然。
eg. He made that remark by design.
他故意那样说。
2. take care of
照顾；照看；看护；
eg. About 1,200 personnel will remain behind to take care of the air base.
大约会有1,200人留守看管这个空军基地。
eg. I take care of both to the best of my ability.
我尽我所能把两方面都照顾好。
3. be keen on doing sth.
渴望的；热切的；热衷的；
eg. I'm not really keen on having a meal with her.
我其实不喜欢同她一起吃饭。
eg. He is very keen on playing hockey.
他非常热衷于打曲棍球。
4. break down
（机器或车辆）出毛病，损坏；
eg. There was a fuss when the bus broke down again.
巴士又出故障时大家都抱怨起来。
eg. My car's on its last legs — it keeps breaking down.
我的汽车快不行了——总出毛病。