laugh down . defeat， dismiss or silence by laughing用笑声压倒、拒绝或打断

The audience laughed the speaker down．听众的笑声打断了演讲者的谈话。

I don't know why they laughed down my proposal．我不懂他们为什么用笑声来拒绝我的建议。

laugh off . dismiss with a laugh as not important or not serious； not take seriously一笑置之；不予重视

This is a mistake that can't easily be laughed off．这不是一个可以等闲视之的错误。

He had a bad fall while ice skating but he laughed it off．他在溜冰时重重地跌了一跤，但他一笑了之，没把它当回事。

laugh off . escape from or get rid of by laughing以笑来排除；笑着逃过

We could but laugh off his suspicions．我们只好以笑声来排除他的疑心。

Beset with embarrassing questions at the press conference， the diplomat tried to laugh off his predicament．在记者招待会上，这位外交官给一些难题弄得很尴尬，只好以笑声加以掩饰。

laugh over . laugh while talking about笑着谈论

We laughed over the tale we had just heard．我们笑着谈论那则刚刚听到的故事。

The old couple laughed over the letter they had received from their little grandson．老俩口收到小孙子的来信，一边谈一边笑。

 launch out into .  launch into . make a start on开始；发动

After leaving college，David launched out into a business career．大学毕业后，戴维就经商了。

They are launching out into a series of scientific experiments．他们正在着手进行一系列的科学试验。

Mr．Burk used the money to launch into a new business．伯克先生利用这笔钱开始搞一项新的企业。

 launch out into .  launch into . speak out critically大发议论；批评；谴责

He at once launched out into oaths and curses．他突然大肆咒骂起来。

at first he spoke slowly and gently，but then launched out into fierce words of criticism．一上来他讲话语气平缓，可后来就言词激烈地批评起来。

The opposition launched into a violent attack on the government．反对党猛烈地攻击政府。

He launched out into a colourful description of his journey．他开始绘声绘色地叙述他的旅行见闻。

launch on . launch upon .make a start on； commence开始

The opposition speaker launched a bitter attack on the government's mishandling of the taxpayers'money．反对党演讲者猛烈抨击政府使用纳税款不当。

The factory launched on the production of walking tractors on a large scale．这家工厂开始大规模地生产手扶拖拉机。

 lay about . attack袭击

The three men laid about him with their hands and boots．三个家伙对他拳打脚踢。

He rushed upon those who were causing the trouble， and laid about them．他冲向那些肇事者，把他们痛打了一阵。

lay aside . put to one side；cease temporarily some work or activity in which one is engaged暂停某一工作或活动

at eight o'clock every evening she laid aside whatever she was doing to tell the children a story before they went to bed．每晚一到八点，她就丢掉手头在做的一切，给孩子们讲故事，以让他们睡觉。

The students laid aside their books to listen to the news broadcast．学生们收起书本去听新闻广播。

Lay aside your book and go to bed．放下你的书去睡觉吧。

lay aside . save； put by for some special purpose节省；为特定目的而积蓄

He is laying aside money for his old age．他在积蓄钱以备晚年。

Half the prize money he spent，and the rest was laid aside for a rainy day．他花了一半奖金，其余的钱存起来以备不时之需。

She laid aside one hour a day for reading．她每天抽一个小时来看书。

Every family has spare money to lay aside and surplus grain in store．家家有存款，户户有余粮。

lay aside . abandon；reject抛弃；拒绝；除去

He has laid aside the habit of smoking．他已戒烟。

It is time to lay aside our differences and work together for a shared purpose．是我们放弃不同意见，为共同目标而通力合作的时候了。

I want you to lay aside these useless prejudices．我希望你丢开这些无益的偏见。

lay away . save储蓄；把商品留存起来（待以后交货）

She laid a little of her pay away each week．她每周储蓄一点薪金。

The store would be glad to lay away this dress for you till Christmas．本店愿意把这服装为你保留到圣诞节。

lay away . bury埋葬

He was laid away in his favorite spot on the hill．他被安葬在山上他最喜欢的地点。

lay by . save，esp．a little at a time储蓄；储存

He laid a little money by every week till he had enough for a trip to Florida．他每周储蓄点钱直到足以去佛罗里达旅行一趟为止。

The farmer laid by some of his best corn to plant the next year．这位农场主留存了一些最好的玉米，以备来年下种之用。