jump to a conclusion贸然断定
join hands with互相合作，携起手来
join in（the game）参加(活动)
join the party/army/club
join（sth）up参军，联起
judging by 从…判断
jump the queue/line 插队；
just now 现在，眼下；刚才

keep down限制，压住;压制;缩减
keep from 隐瞒，瞒住；避开；使免于
keep off 驱散；避开；防止，不接近
keep on 继续…；不停地…
keep to 恪守；遵守；遵循；坚持(做)
keep under control 控制
keep up (with) 跟上；保持；及时了解(情况)
knock down 拆除；拆卸；撞倒；使减价
knock off停止工作；减低，扣掉；匆忙knock out 敲出；击倒；击昏；使失效；
knock over 打翻
keep an eye on 注意，监视
keep away站开；使离开
keep company with 陪伴..
keep early hours 早睡早起
keep from  阻止；使免于；隐瞒
keep in touch with和…保持联系
keep off 避开；不让…接近
keep on good terms 保持友好关系
keep on 继续进行，反复地做
keep one's balance 保持(身体)平衡
keep one's eyes open 留心看着；
keep one's word  守信用，遵守诺言
keep pace with与…齐步前进
keep silence（over 保持沉默，不讲话
keep track/ trace of跟踪；注视…的动向
keep a record of 记载，记录
keep a secret=keep to oneself保守秘密，
kind of+adj  (状语)有点儿，有几分
know about（0f了解，知道…的情况
know better than 很懂得(而不至于)

labour along缓慢而费力地前进
laugh at 嘲笑
lay aside 把…放在一边；储存
learn by heart 记住，背诵
learn from 学习，向…学习
learn of(about) 得知；获悉…的事
leave alone 不管，不理会；不打扰
leave off  使)停止；停下来
lack of 不够；不足；没有
have a good laugh over 对 .大笑一番
laugh off 一笑置之；把…当儿戏

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