中英释义：
aboutprep.关于；有关；在…期间；（表示大约的时间或数量）在…左右；在…前后；围绕；在…周围；在…附近；在…各处；在…到处；在…四处；对于；为了；在…方面；涉及；涉及…方面；在…上
roundadj.圆形的；球形的；弧形的；全面的；完整的；充分的；丰满的；饱满的；圆润的；圆满的；无棱角的；平滑的
U-turnn.（汽车等的）U形转弯；掉头；180度转弯；180度大转变；完全相反的决策；（政策、行为上令人尴尬的）彻底转变
about-facen.（态度或观点的）彻底改变；完全转变；180度大转变
掉头发
lose hair
掉头逃跑
turn tail and run
把车掉头
turn a car about
请在安全的地方掉头。
Please turn around at a safe place.
他开过了出口，不得不掉头。
He missed the exit and had to turn around.
你需要掉头才能到达目的地。
You need to turn around to reach your destination.
司机被要求在红绿灯处掉头。
The driver was asked to turn around at the traffic light.
请掉头再往回走一条街.
Turn around and go back one block.
你们要掉头，前面有一场很严重的事故。
You folks need to turn around, there's a pretty bad accident up ahead.
我被告知，一到有这个“小心熊出没”的标志就立刻掉头。
I was told to turn around as soon as I got to the polar bear warning sign.
总之，我们得掉头，我们会做更充足的准备，准备好面见知识渊博君。
Anyway, We had to turn around, but we're gonna go back better prepared and ready to meet the knowledgeable one.
科学家把传感器放在机器人的“鼻子”和“尾巴”上，这样当他们遇见一面墙时，就知道掉头了。
The scientists put sensors on their robots noses and tailsso if they meet a wall, they know to turn around.
托换移位技术在地下工程中主要应用于隧道施工下穿既有建筑物、桩基以及盾构机掉头等工程。
As underpinning technique has been mainly used in situation like tunnelling underneath existing buildings, or pile foundation and TBM turn around, so far as underground construction is concerned.
当我到达那里，我想既然我跑了那么远，也许不如掉头继续跑。
When I got there, I figured since I'd gone this far, might as well turn around, just keep on going.
《阿甘正传》《Forrest Gump》
然后当我跑到另一个大海，我想既然我跑了那么远，我也许不如掉头继续跑下去。
When I got to another ocean, I figured since I've gone this far, I might as well just turn back and keep right on going.
《阿甘正传》《Forrest Gump》
