try out . test； use during a trial period试验；试用
The new kind of engine must be tried out before they are sold．新型发动机在销售之前一定要进行试验。
They let me try out the sewing machine for several days before buying．他们让我先试用几天这台缝纫机再买。
tune in . adjust（收音机）调谐
Some nights I can tune in that station．有些晚上，我能够接收到那家电台的广播。
tune up . begin to sing or play开始演（唱、奏）
Birds tune up on early spring mornings．春天的早晨，鸟儿都放开了歌喉。
turn a deaf ear to . refuse to listen to对…置之不理；对…置若罔闻
He has turned a deaf ear to what his parents said．他对父母的话置之不理。
turn against . oppose（often after earlier support）对…采取敌对态度；反抗
He turned against his best friends．他对最好的朋友也采取了敌对态度。
turn around . make a complete turn in order to face in the opposite direction转身；转向
please help me to turn the car around．请帮我将车调过头来。
turn away . turn in a different direction转向别处
Please don't turn your head away while I am talking to you．我和你谈话时，请不要把脸转过去。
turn away . refuse to admit不许进入
Hundreds of people were turned away from the theatre．数以百计的人未能获准进入剧场。
turn back . return返回
They walked for two hours and then turned back．他们走了两小时后又返回来了。
turn down . refuse to accept； reject拒绝
I am afraid your request for a pay rise was turned down again．恐怕你们要增加工资的要求又一次被拒绝了。
turn down . reduce in speed or volume减弱；调低
Please turn the radio down； I am trying to sleep．请将收音机音量调小，我想睡觉了。
turn in . deliver送交
Don't forget to turn in your gun when you leave the army．离开部队时，别忘了把枪交上来。
turn in . go to bed睡觉
I feel very tired and want to turn in now．我觉得很累，想现在就睡。
turn into . enter by making a turn转入
There is a strange vehicle turning into our street．有一辆陌生的车子拐入了我们这条街。
turn into . transform into变成；译成
Turn the following Chinese into English．将下列汉语译成英语。
turn off . switch off关掉
Please turn the lights off when you leave the room. 离开房间时请把灯关掉。
turn on . switch on打开
Please turn the lights on for me；it,is,getting dark．天黑了，请帮我打开灯。
turn on . turn against攻击；反对
The dog turned on me and bit me in the leg. 这狗向我扑来，咬了我的腿。
turn one's back on . turn rudely away； refuse to speak to不理睬
Never turn your back on backward students. 决不能漠视落后的学生。
turn one's back on . refuse to help 拒绝帮忙
Don't turn your back on those who really need help．对那些确实需要帮助的人不要拒绝。
He never turned his back on his neighbors when they needed help.他的邻居需要帮助时，他从未置之不理。
turn one's back on . abandon放弃
He turned his back on the old working method．他放弃了老的工作方法。
turn over . give control to； give ownership to 移交（管理权、业务等）
Since the original owner was now too old to hold on to his business， he turned it over to his son. 原来的主人因年迈而不能继续从业，就转交给他儿子了。
When the company president resigned， he turned control over to his associate. 公司总裁辞职时，把管理权让给了副总裁。
turn over . hand over； turn in（to the police）上交（警察等）
I turned the thief over to the police．我把窃贼交给了警方。
turn over . turn upside down翻转
The car turned over three times after the crash．撞车后，小汽车翻了三个跟斗。
turn over . think about carefully考虑
You'd better turn the matter over．你最好考虑一下此事。
turn out . result结果证明
What he had said turned out false.他的话结果证明是假的。
turn out . produce生产
The school has turned out some good scholars．该校培养出了一些优秀的学者。
turn out . appear出现
A lot of people turned out for the rally．许多人参加了集会。
turn round . move so as to face the other way转脸
Turning round，I saw a snake crawling toward me.回过头时，我看见一条蛇正向我爬来。
turn round . revolve旋转
The earth turns round the sun．地球绕太阳运行。