He's fallen far behind in his work.
他的工作大大落后了。
If you're a slow learner, you can fall behind in regular school.
如果你学得慢，那你在正规学校可能会落后。
我工作落后了。
I'm already a month behind in my bills and my tuition's due soon.
我已经拖欠了一个月的账单，而且我的学费很快就要交了。
All four of these countries lagged considerably behind in the early nineteenth century.
这四个国家在19世纪早期都相当落后。
For the second experiment, Baker told the subjects that they would be stared at from time to time from behind in a laboratory setting.
在第二个实验中，Baker告诉实验对象，他们在实验室里会被不时地从后面盯着看。
Preventable water-related diseases kill an estimated 10,000 to 20,000 children every day, and the latest evidence suggests that we are falling behind in efforts to solve these problems.
据估计，与水有关的可预防疾病每天导致1万至2万名儿童死亡，而最新证据表明，我们在解决这些问题方面仍处于落后状态。
He was terribly behind in his work.
他积压了大量工作。
We are lagging behind in the childcare stakes.
我们在儿童保育竞赛中正落在后面。
Carmen stayed behind in the dark, sunless room.
卡门待在那个黑暗的不见阳光的屋子里。
Britain is being left behind in the race for new markets.
英国在开拓新市场方面正被甩在后面。
Many people have stayed behind in the potential war zone.
许多人留在了可能交战的地带。
They set off, two men out in front as scouts, two behind in case of any attack from the rear.
他们出发了，两人在前作为侦察员，两人殿后以防后方攻击。
"Left-behind" children hardly ever see their parents, because their parents work in the cities, leaving them behind in the countryside to be cared for by their grandparents.
“留守儿童”几乎见不到他们的父母，因为他们的父母在城市工作，把他们留在农村，由他们的祖父母照顾。
It was as though it stayed behind in the marketplace.
它好像被市场抛弃了。
The post office got behind in delivering Christmas mail.
邮局没有及时发送圣诞节邮件。
The rocks left long moving tracks behind in the mud surface.
岩石在泥浆表面留下了长长的移动痕迹。
It was left behind in Paris and won't arrive until later this evening.
它被留在巴黎了，今天晚上才会到。
Thus, more of the heavy isotope is left behind in the ocean and absorbed by marine organisms.
因此，更多的重氧同位素留在了海洋里，并被海洋有机物吸收。
Ruben Sergeev said the country was afraid of falling behind in a new arms race.
鲁本·谢尔盖耶夫说该国害怕在新一轮军备竞赛上落后。
He's lagged behind in his studies.
他功课退步了。
So he fell behind in his studies.
于是他学习落后了。
Soon he fell behind in the race.
很快他在赛跑中落在了后面。
就是出租车后面的一件！
我工作进度落后了。
我工作进度落后了。
我睡眠不足。
Mr Brown, well behind in the polls, demurs.
（在民意调查中远远落后的布朗先生则有异议）。
Mr Brown, well behind in the polls, demurs.
（在民意调查中远远落后的布朗先生则有异议）。
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