好处是，你只需向回输送就能掉转方向把信息发给来信者，而不用费事写地址，贴邮票，装信封。

The nice thing is you can turn them around by simply forwarding back without having to worry about addressing or stamping or enveloping the information to the person that sent you the message.

youdao

他伸手来抓方向盘，但我把他推开了。

He snatched at the steering wheel but I pushed him away.

《牛津词典》

他们冲到高速公路时，他赶紧把摩托车调转方向。

He slewed the motorbike over as they hit the freeway.

《牛津词典》

So, if instead you put your particle somewhere down here on the electric field, or on the wave, the electric field will now be in the other direction so your particle will be pushed the other way.

还有方向，所以如果,你把粒子放在这下面，电场的方向相反,粒子会朝另一个方向运动。

麻省理工公开课 - 化学原理课程节选

And we're going to have q2 prime, and we're going to draw the arrows in the positive direction in these cases.

还有q2一撇，在这个例子中,我们把箭头朝正方向。

麻省理工公开课 - 热力学与动力学课程节选

I am only counting in one direction, 2 so I have to multiply this whole thing by two because I have to count both directions.

因为我只是在一个方向上计数，所以我要把这些所有乘以,因为我们必须考虑到2个方向。

麻省理工公开课 - 固态化学导论课程节选