touch off（及物，不可分）激起
His speech touched off a hot debate.他的发言引起了激烈争辩。
What touched off his illness？是什么使他生病？
Negligence touches off many accidents.粗心大意导致许多事故的发生。
The invasion of that country touched off the whole people's resistance.对那个国家的入侵激起了全民的抵抗。
touch on ［upon］（及物，不可分）略微提到
The speaker touched on the subject of women's rights in his speech.这位演讲者在他的演说中谈到女权问题。
His acadamic report was mainly about earthquake prediction，but it also touched on meteo ro logical observation.他的学术报告主要讲地震预报，但也谈到气象观测。
In his book on astronomy，he touched on geophysics.他关于天文学的书提到地球物理学。
The statement touched on the border disputes.这项声明提到了边界纠纷。
touch up（及物，不可分）润色
He always touches up each of his articles many times before publication.他总是把他的每篇文章进行多次修改之后才发表。
Ask the master to touch up your picture.请求师傅修饰一下你的照片。
Several places must be touched up in this article.这篇文章中有几处必须修改。
It's an article with original ideas but it needs touching up.这是一篇很有见解的文章，但需要润色。
trifle with（及物，不可分）看不起，冷淡
You musn't trifle with people who haven't had much schooling.不应轻视没有受过多少学校教育的人。
He is a distinguished guest.Don't trifle with him.他是个贵客，别怠慢了他。
See that none of the guests are trifled with.当心不要怠慢了客人。
He trifles with us because he thinks he's a cut above others.因为他自以为高人一等，所以看不起我们。
try on（及物，可分）试穿［戴］
Gorle tried on some new shoes，but they were too small.戈尔试穿了一些新鞋，可是它们都太小。
A girl was trying on a fur coat in the shop.一位姑娘正在店里试穿一件皮大衣，看是否合身。
Let me see you try this coat on.让我看你穿上这件上衣试试。
She tried on five straw hats and found none of them that she liked.她试戴了五顶草帽，没有发现一顶中意的。
try out（及物，可分）试验，试用
Try out the brakes before you drive down a hill.开车下山前试试刹车灵不灵。
Before you buy a TV，try it out.买电视机前要试一下。
These wet roads really try out a car's tyres.潮湿的马路对汽车轮胎真是一个考验。
The programme needs to be tried out.这项计划需要经过检验。
try out for1（及物，不可分）参加（运动员等的）选拔
She is an outstanding singer，but she hasn't tried out for a musical group.她是个优秀歌手，但她没参加过音乐团体的选拔赛。
James tried out for the track and field team.詹姆斯参加了田径队的选拔赛。
Smith tried out for the football team.史密斯参加了足球队的选拔赛。
try out for2（及物，不可分）力求获得，争夺
George tried out for a place at their school but didn't come off.乔治想在他们学校里谋取一个职位，但没成功。
The two countries tried out for the market of textiles.两国争夺纺织品市场。
Two football teams are trying out for the European championship.两个足球队正在争夺欧洲冠军。
try...out ［try out...］on...（及物，必分）征求（别人）对…的意见
Hord tried his article out on Rabon (or：Hord tried out his article on Rabon).霍德征求拉本对他的文章的意见。
You should try this matter out on your lawyer (or：You should try out this matter on your lawyer).这件事情你应当请教你的律师。
tuck in（不及物）痛快地吃
It's unnecessary to tuck in at the Spring Festival.没有必要在春节大吃特吃。
It's bad manners to tuck in at a party.在宴会上张口大嚼是不礼貌的。
How delicious the roast duck is！Tuck in！这烤鸭真可口！敞开肚皮吃吧！
tuck into（及物，不可分）痛快地吃
He has been ill since he tucked into a meal of roast duck yesterday.他昨天大吃了一顿烤鸭后就病了。
It's impolite to tuck into eatables at a reception.在招待会上大吃大嚼是不礼貌的。
tune in1（不及物）调整（收音机或电视机）的频率（以使声音或图像清晰）
At first I tuned in to hear the news，but I couldn't hear it.I had to tune in again.起初我调整频率收听新闻，但听不见，我得重调。
I always tune in to Radio Beijing at 7 o'clock.我总是7点钟听北京台广播。
tune in2（及物，可分）选（台或频道）
We tuned in Channel 6，but the picture was not clear.我们调到6频道，可是图像不清。
Mrs Smith tunes BBC in every night.史密斯夫人每晚都收听英国广播公司广播。
tune up1（及物，可分）调整［检修］（机器等）
I have to tune up my clock at least once a week.我每周至少必须对一次钟。
I must tune my watch up，it's slow.我得调整我的表，它走慢了。
An automobile engine should be tuned up after a few thousand kilometers.汽车开了几千公里后就该检修一下发动机。
tune up2（不及物）（演奏者）调音
The orchestra had tuned up when the concert began.音乐会开始前管弦乐队已调好音。
Before the performance the violinist tuned up.演奏前这位小提琴手为他的乐器调音。
A traditional instruments orchestra must tune up to ensure every successful performance.民乐队必须调音以保证每次演出成功。
turn against（及物，不可分）转而反对［敌视］
Some people turn against their friends.有些人转而敌视他们的朋友。
Some of the employees turned against their employer.有些雇员倒过来反对他们的老板。
Why did they suddenly turn against you？他们为什么突然转而反对你？
Nothing can make me turn against my country.什么也不能使我背叛祖国。