When you come to a closed door, check it with the back of your hand.

当你走到一扇关着的门前时，用手背检查一下。

youdao

A Colombian who wants someone to approach him often signals with a hand movement in which all the fingers of one hand, cupped, point downward as they move rapidly back and forth.

一个哥伦比亚人想要别人靠近他时，他通常会用一个手势，一只手的所有手指都呈杯状，指向下方，同时快速地前后移动。

youdao

My mother was so touched by her gesture that she decided to go back to the store and give the cashier a five-dollar bill to keep on hand in case the same happened to someone else if they didn't have enough money for all of their groceries.

我母亲被她的举动感动了，她决定回到店里，给收银员一张五美元的钞票，让他放在手边，以防别人在没有足够的钱支付所购买的东西时发生同样的情况。

youdao

One of the hands keeps a flat hand shape and it just kind of lightly moves back and forth as if it were a flickering image on a screen."

VOA: special.2011.04.13

It watched the back of his neck and hat for a minute, and then a hand came in and sat on his shoulder.

他从后面看了看,那个人的脖颈和帽子，然后将手伸进了车窗,搭在了他的肩上。

耶鲁公开课 - 1945年后的美国小说课程节选

Does it make sense to think we could do this in less than linear time? You know, it takes a little bit of thinking. What would it mean do I see a hand way at the back, yes please? Thank you.

你要稍微想一想，这意味着什么？,那儿是有人举手么？后面的,请你来回答吧,谢谢你，小伙子,你让我体会到我上课的价值。

麻省理工公开课 - 计算机科学及编程导论课程节选

As the event neared its conclusion, a man in the back of the restaurant raised his hand and broached a topic not often heard at the VFW and American Legion halls where McCain preferred to campaign.

CNN: Analysis: Is McCain finding his way on faith?

He went off his left foot to the right and sent a back of the hand to Jones who was racing behind him and crashed over.

BBC: Newcastle 29-24 Dragons

While I know how to forecast and operate a service company like the back of my hand, modeling a hybrid company that provides both service and software is another story.

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