J
jump to a conclusion草率决定
just now刚才；现在，眼下
K
keep an eye on留意；照看
keep back阻止，阻挡；隐瞒，保留
She told us most of the story, but kept back the bit about her uncle.
I kept a few books back and gave him the rest.
The police tried to keep the crowd back from the injured man.
警察试图挡住人群，不让他们靠近受伤的人。
He can keep nothing back from his friends.
他向朋友什么也瞒不住。
The boss keeps back $50 a month towards my uniform. 老板每月扣我50美元服装费。
keep down控制；减少
They are taking steps to keep down the rabbit population.
他们采取步骤控制兔子的繁殖增长。
Chemicals are used for keeping insects down.
The Jackson’s tried to keep their costs down
keep in mind记住
keep off避开；不接近
Keep off the grass! 请勿践踏草地！
My doctor has warned me to keep off sugar. 我的医生劝我别吃糖。
Keep your dog off me. 把你的狗从我这儿拿开！
Keep off oil, or else it will perish your rubber boots. 不要碰油,否则会把你的橡胶鞋弄坏的。
keep on继续下去；反复地做
He just kept on writing. 他正在继续写。
keep one’s head保持镇静
keep one’s word守信用
keep pace with（与…）齐步前进
keep to遵守，信守；坚持
He always keeps to his promises.
他总是说话算数的。
We kept to the roads we knew.
我们不离开我们认识的路。
keep up继续；保持
If this rain keeps up the garden will be ruined. 如果这雨继续下，花园就完蛋了。
The high cost of materials keeps up prices.
材料的昂贵费用使价格居高不下。
Keep your chin up! 不要气馁!;不要灰心!
keep up with跟上；赶上
Don't run — I can't keep up with you.
别跑了，我赶不上你了。
Are wages keeping up with inflation?
工资跟得上通货膨胀吗？
kind of有点儿，有几分
She kind of hoped to be invited.
她有被邀请的希望。
knock down撞倒，击倒；拆掉
Alex was knocked down by a bus.
Our house is being knocked down to make for a new road.
knock out击昏；击倒
L
laugh at因…而笑；嘲笑
Don't laugh at him.别嘲笑他。
We all laughed at his joke.
听了他的笑话我们都大笑起来。
People have often laughed at stories told by seamen. 人们常常嘲笑海员所讲的故事。
Everyone laughed at his foolish antics.
大家都笑他那种愚蠢的滑稽动作。
lay aside把…搁置一旁，收起；积累
lay down放下；拟订，规定
lay down the law立法
lay off（临时）解雇 ；休息，戒
the factory has laid off a hundred workers.
The doctor advised the managing director to lay off for a couple of days.
医生劝总经理休息几天。
lay out设计；安排；展示
lead the way带路，引路
learn by heart记住，背诵
leave alone不打扰，听其自然
leave behind忘了带，不带；遗留；落后
leave off停止，中断
He has left off working.
leave out漏掉，删掉；省略
Tom left out that part of the story.
let alone更不用说
He hasn't enough money for food, let alone amusements.
他连吃饭钱都不够，就更不用说玩儿的钱了。
The baby can’t even walk, let alone run.
let down加长 放下，降低；使失望
let go (of)放开，松手
let off排放；放过；宽恕；（在…）下车
Some judges will not let young criminals off, they make them go to prison.
She let the boy off (doing) his music practice.
let out放走，释放；发出（声音）；泄露
line up排队，排成一行
About a hundred people lined up in front of the theatre.
little by little一点一点地，逐渐地
live on靠…生活；维持生命
the sick man lived on chicken soup for a week.
live through经受住；度过
Many people lived through the earthquake.
live up to不辜负；遵守诺言
He was a man who lived up to his promises.
I hope I can live up to the expectations of my parents.
We will live up to what our parents expect of us. 我们决不辜负父母亲对我们的期望。
look after照顾；关心
My friend looked after my cat while I was on holiday.
在我去度假的时候，我的朋友照料我的猫。
Robert's old enough to look after himself.
罗伯特这么大了,已经能照顾自己了。
look at看；观察；查阅
look back回头看；回顾
From this time on, he never looked back.
从此以后他便不断进步了。
After he won the first game, he never looked back. 他胜了第一局后,就节节胜利。
look down on / upon轻视，看不起
Some boys usually look down on little girls and refuse to play with them.
look for寻找，寻求；期望
look forward to盼望；期待
We are all looking forward to our holiday.
我们都盼望着假期。
I'm looking forward to seeing you this summer vacation. 我盼望今年暑假见到你。
look in顺便看望；顺便拜服
I’ll look in this evening to see how she is.
look into调查，深入了解
I’ll look into your complaint at once.
look on观看，旁观
May I look on with you?
我可以跟你合看这本书吗?
The bull looked on sympathetically until the drunk was out of the way before once
more turning its attention to the matador.
这头公牛一直同情地望着醉汉,直到醉汉不见了才重新把注意力转向斗牛士。
look out注意
Look out, there's a car coming.
留神，汽车过来了。
Look out! There is danger ahead.
当心!前面危险。
look over翻阅，浏览
look through浏览；详细调查
Look through these photos and try to pick out the man you saw.
look up查阅，查出；看望
Things are looking up! 情况正在好转!
When you do not understand a word, you can look it up in this dictionary.
当你不懂一个单词时，可以查这本词典。
On my way home, I looked up an old friend of mine.
在回家的路上,我去看望了一下我的一个老朋友。
lose heart丧失勇气，失去信心
lose one’s head被砍头；丧命；慌张
lose one’s temper发怒，发脾气
He lost his temper. 他发脾气了。
lose sight of看不见；忘记，忽略
In the heat of the argument, we mustn’t lose sight of our main purpose.