jump off 开始，开始进攻
just about 差不多，几乎
just as 正象；正当…的时候
just the same 完全一样
do justice 公平对待；和…酷似
be keen about 喜爱，对…着迷
be keen on 喜爱；渴望
keep away 站开；使离开
keep back 留在后面；阻止；隐瞒
keep company with 和…交往
keep down 控制；压服；缩减开支
keep from 阻止；使免于；隐瞒
keep in mind 记住
keep off 避开；不让…接近
keep on 继续进行，反复地做
keep out of 躲开，（使）置身…之外
keep to 坚持；固守（习惯等）
keep to oneself 保守秘密，不与人来往
keep under 压制；控制
keep up 继续；坚持，维持
keep up with 跟上，不落后
kill off 消灭，杀光