Why the ice periodically advances - and why it retreats again - is a mystery that glaciologists have only just started to unravel. Here's our recap of all the back and forth they're trying to explain.
为什么冰层会周期性地推进，为什么又会消退，这还是个谜，冰河学家们正试图揭开谜底。
Pairs of opponents hit the ball back and forth until one winner emerges from all who entered.
一组组对手来回击球，直到所有参赛者中出现一名胜利者。
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。
You can switch back and forth between data and code sections, but when the program is assembled it will bring all of each section together into one unit.
您可以在数据部分和代码部分之间自由切换，但当程序被汇编时，会将所有部分汇编到一起，组成一个单元。
It can talk back and forth with a server all it wants, without the user ever knowing about what's really going on.
它可以根据需要自行与服务器进行交互，用户甚至可以完全不知道幕后发生的一切。
The library itself handles all the connections, authentication, error handling, and the back and forth.
该库本身处理所有连接、身份验证、错误处理等等。
The good you do the kindness proffered the love and good will you send forth will all come back to you multiplied in many ways.
你做的好事，你向他人付出的善意，你表达出的爱和好心，都将会以多种方式成倍地回馈给你。
The good you do, the kindness proffered, the love and good will you send forth, will all come back to you multiplied in many ways.
你做的好事，你向他人付出的善意，你表达出的爱和好心，都将会以多种方式成倍地回馈给你。
All this back and forth raises a lot of questions for the editors here at SELF, and we figured it must have the same effect on our readers.
来来去去间产生了许多问题让《悦己》的编辑感到困惑，我们也觉得我们的读者也是有同感的。
All day long he flies back and forth from his branch to the feeder.
这一整天，他在喂料器和枝桠之间来来回回。
So rather than clicking and going back and forth between each ad, you can get a nice scan of all the options with a quick swipe.
因此您可以很快的就可以浏览不同的选择，而不需要来回的点击每一个广告。
That's not all though-you'll also display a list of page Numbers that allow users to jump back and forth in the result set.
这还没有完成！您还将显示一个页码列表，并允许用户在结果集中前进或后退。
Now take that piece of dangling gold thread and go back and forth over and around the angel, crossing over the chest and back and under the arms to secure it all.
现在用金线绕着天使的胸、背部和臂下来回缠绕。
My father was an ordinary veterinarian. He was outside all day back and forth, his face tan with the skin of black Africans in general.
我的爸爸是一名普普通通的兽医。他整天都在外面奔波，脸上的皮肤晒得跟非洲人一般黑。
Your prior idea results from a still prior idea—and that idea from another, and so forth, like building blocks, until you get all the way back in the hall of mirrors to what I call first thought.
你先前的想法是更早一个想法所结果――而那想法又来自更早的一个，如此类推，象建材一样，直到你回溯到我所谓第一个思维的镜厅。
You will experience living in the continuum, where all lifetimes are happening simultaneously, and you will travel back and forth between Earth and worlds with compatible energy levels.
你们将体验到生活在连续体中，这里所有的人世经历都在同时发生着，你们可以往回或往前，在与地球能量兼容的能量层次。
But the back-and-forth between the two companies is increasingly tense, and some sources close to the deal suggest that a white knight might surface after all.
但是，二家公司之间的你来有往状态正日趋紧张，靠近交易的消息人士暗示“白衣骑士”毕竟要浮出水面。
Once you've done all the sides, you can gently use that old back-and-forth motion to clean the top chewing surfaces of your teeth.
一旦刷完了内外两面，轻轻地使用旧式前后移动的方式来清洁牙齿的咀嚼面。
Com links all of components in the system together, enabling them to pass requests and information back and forth.
COM将系统中的所有组件连接在一起，允许它们来回传送请求和信息。
He keeps walking back and forth, with the seed in a pouch and spreads the seed, back and forth, all day long.
他一边撒种，一边来来回回地踩踱田地，从早到晚走个不停。
After a few minutes of silence and many cigarettes passed back and forth we debated the best way for me to get out of the country. We debated it all the way back to Damascus.
在几分钟的沉默之后，我们互相交换着香烟，争论各种让我离开这个国家的最佳路线，我们在回大马士革的一路上都在讨论这个问题。
We travel back and forth all the time between Canada and England.
我们总是在加拿大和英格兰两地来回旅行。
They prayed and prayed, but Diao stayed down on all fours and kept crawling back and forth across the room. Nobody could stop him, even if they tied him.
他们不停地祈祷，但是刁还是四肢着地，在房间里不断爬来爬去。没人可以阻止他，即使把他绑起来。
But really, the wind is really too much to go back and forth all the difficulties.
不过说真的，风也真是太大了，来来回回走得都困难。
Then he set them all to swinging back and forth, like the lamps in the cathedral.
接着他晃动所有的砝码，让它们像教堂里的油灯一样地来回摆动。
Some modern rhetoricians advocate a dramatic, back-and-forth presentation of pros and cons rather than saving all the refutation for the last major body section.
某些现代修辞学家提倡一种颇具张力、前后交叉的正反辩论法，而不是把所有的反驳集中到最后的主要章节里。
In looking at all of the back and forth over the years, I have two observations.
在后并提出这些年来，请寻找在我有两个观察值。
In looking at all of the back and forth over the years, I have two observations.
在后并提出这些年来，请寻找在我有两个观察值。
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