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K3uANq;;SxKS_。
eg. He made that remark by design.
他故意那样说c2+Xt4K*d8mu[。
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%xLYa2Qej#=。
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RNnoEuv]XMgsH。
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|QFiGyBAE%P=。
eg. He is very keen on playing hockey.
他非常热衷于打曲棍球#7+cs2|O[,NPor]bhqA。
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D1T7~gdEm,pYjSr+D,8。
eg. My car's on its last legs — it keeps breaking down.
我的汽车快不行了——总出毛病Eox]vFRvfK1((rs_AKi^。