We've been discussing films in the 1920s and 30s, and how back then film categories, as we know them today, had not yet been established.
我们一直在讨论20世纪二三十年代的电影，以及当时还未形成的、而如今已被我们熟知的电影类别。
They analyze the echoes, how the waves bounce back.
他们分析回声，以及波是如何反弹回来的。
Every time Tony found some small fish in the nets, he would say to himself, "How poor you are!" Again, Tony threw the small fish back into the sea.
每当托尼在网中发现一些小鱼时，他就会自言自语道：“你真可怜！”托尼又把小鱼扔回了大海。
Occasionally one can determine whether stone tools were used in the right hand or the left, and it is even possible to assess how far back this feature can be traced.
偶尔，人们可以确定石器是用在右手还是左手上，甚至可以评估这种特征可以追溯到多远以前。
Few of us wish to turn the clock back, but perhaps we need to remind ourselves how useful the right obstacles can be.
很少有人希望时光倒流，但或许我们需要提醒自己，适当的障碍是多么有用。
I thought how I could lean my head back to rest on her shoulder whenever I wanted.
我想着自己是如何在无论何时只要愿意就可以把脑袋倚靠向后休憩在她的肩头。
It is not clear how many of them will be heading back to Saudi Arabia tomorrow.
尚不清楚他们当中有多少人明天将折回沙特阿拉伯。
Looking back, I am staggered how easily it was all arranged.
回顾过去，我感到惊讶的是，这一切都那么轻易地安排好了。
Everyone understood how hard it was to get back into the swing of things after such a long absence.
每个人都明白离开这么长一段时间后要重新全力投入有多难。
It has set us back in so many respects that I'm not sure how long it will take for us to catch up.
我们在很多方面都被延误了，不知道需要多久才能赶上。
She's always harking back to how things used to be.
她总是念叨以前的世道。
How would you handle being locked in the back of a cab while the driver hurled abuse at you?
如果你被锁在出租车后座又遭司机谩骂，你会怎么办？
No matter how many times I repeated my story, we came back to the same place.
不管我复述了多少遍我的故事，我们还是回到了同一个地方。
When he got back, he switched labs to study how cerebrospinal fluid nourishes the developing nervous system.
回来后，他将实验室里的研究课题转向了脑脊液如何滋养发发育中的神经系统。
"It will come again," the grandfather called up from below; "how could I know that you were coming back?"
“它很快就会被搬回来的，”祖父从下面喊道，“我怎么会知道你要回来呢？”
Millie smiled back! She didn't know how to start jumping with a long rope.
米莉笑着回应！她不知道如何开始用一根长绳子跳。
At the end of an iteration of work, we always look back at how we did and figure out what we can do differently next time to improve.
持续的反馈和改进：在重复工作的结束时，我们总是回顾我们是如何做的，并找出下次改进时我们可以做的不同之处。
Firstly, you have to think about what can I do to respect the building and how can I bring it back to life?
首先，你必须思考我能做些什么来尊重这座建筑，我怎样才能让它起死回生呢?
After you cut out those sections, you'll have to go back and revise the rest, to see how it all fits together.
在你删掉那些部分之后，你必须要返回修改剩下的部分，看看它整体如何组合在一起。
Look back on those days when you were the little child, how many times did you try when no one was watching, or when no one was cheering?
回想一下你小时候的那些日子，在没有人观看或没有人欢呼的时候，你试了多少次？
He'd go back to his office and he'd write these memos, now they were memos to his staff about the problems he had seen, and how they needed to be fixed.
他会回到他的办公室，写下这些备忘录，现在这些备忘录用于向员工转达他发现的问题以及如何解决这些问题。
No matter where people go and no matter how far they go, they will go back home enjoying family time during Spring Festival.
无论人们身在何处、走了多远，在春节期间，他们都会回家享受团圆时光。
On a windy day, he measured how far he could jump with the wind at his back.
在一个刮风的日子里，他测量了自己在风吹着的情况下能跳多远。
They can tell the distance of various objects by how quickly the sound waves bounce back off them.
他们可以通过声波反弹的速度来判断不同物体之间的距离。
How soon will Jim come back from his vacation?
吉姆度假回来要多久？
How soon will you go back to your hometown?
你过多久要回家乡？
How soon will his mother come back?
他的妈妈多久会回来？
Could you please tell me how soon he will come back?
你能告诉我他多久会回来吗？
She offers some ideas on how people can cut back on their cell phone use.
她就人们如何减少手机的使用提供了一些想法。
She offers some ideas on how people can cut back on their cell phone use.
她就人们如何减少手机的使用提供了一些想法。
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