The old man moved away, raising his hand in salutation.

这位老者离开，举起他的手致意。

《柯林斯英汉双解大词典》

For instance, if a car driver slows down to let you cross the road, simply raising your hand in acknowledgement is enough to show that you appreciate the driver's consideration.

例如，如果一辆车的司机为了让你过马路而减速，你只要简单地举起你的手示意，就足以表明你对司机体贴的感谢。

youdao

If Congress wants GM to make more fuel-efficient cars it has a far better remedy at hand: raising taxes on petrol, which is once again absurdly cheap.

如果国会希望通用制造更多节能汽车，还有一种更好的刺激措施：提高燃油税率，目前的油价又跌回了过分廉价的水平。

youdao

Just when I tell you to go, you leave me. You know you can't leave a schoolroom without raising your hand, no matter where you're going."

VOA: special.2009.07.19

OK. Good hand raising technique.

好的，很好的举手表决方法。

麻省理工公开课 - 化学原理课程节选

It's not infrequent that i'll get one or even two people raising their hand that they took Economics 252 from me.

有的时候会有一两个人,举起手说,他们上过我的经济学252号课

耶鲁公开课 - 金融市场课程节选

If Congress wants GM to make more fuel-efficient cars it has a far better remedy at hand: raising taxes on petrol, which is once again absurdly cheap.

ECONOMIST: The car industry

She turned, raising her hand, to tell Jerry to stay outside.

NEWYORKER: Brooklyn Circle

So what do you do when you have 50 percent of your employees in your team, division, or organization urgent and raising their hand to help?

FORBES: The Secret Formula for Corporate Strategy Execution