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Housing in the exurbs got hit hardest, and one reason why is that high gasoline prices made it hard for people to lived in them to keep up with their mortgage payments, and hard for them to sell their homes without taking a steep loss.

城市远郊的房子受到的打击最大，这也是为什么高油价让住在这类房子里的人们难以维持按揭付款、如将房子卖掉将承受巨大损失的一个原因。

Well to keep up with the fads, or season can cost you big.

并跟上潮流，你的成本或季节可大了。

In the Lewis's dual-sector model, we can see that if food supplies to the modern sector do not keep up with the modern sector's demand for labor, the modern sector will have to consume a larger share of its output in feeding its labor force, and this will leave a smaller surplus for capital accumulation.

在刘易斯二元经济结构模式中，可以知道，如果粮食供给跟不上现代部门的劳动力所需要的粮食需求，现代部门不得不为弥补粮食不足而挪用他们生产中的很大部分，以造成减少为再生产需要的资本积累剩余部分。

Meanwhile, classes on gun rules in Phoenix are booked solid for months, ammunition is sold out, and gunmakers and dealers alike are scrambling to keep up with demand.

同时，在Phoenix，有关持枪规则的培训课程连续数月人数爆满，弹药早早售罄，枪械制造商和经销商正忙着加大生产和组织货源，以满足源源不断的市场需求。

I have to work hard to keep up with my classmates.

为了跟上我的同学，我必须努力学习。

James had to run quickly to keep up with the other hikers.

詹姆斯得快跑才跟得上其他健行的人。

Most importantly, how can hoteliers keep up with emerging trends and provide the immediate, real time service that guests demand?

最为重要的是，酒店业者如何才能跟上日新月异的行业趋势，并提供客人需要的迅速和实时的服务？

It is important for dog health to visit your vet on a regular basis and keep up with vaccines.

这是很重要的狗健康访问贵审核定期就和与时并进的疫苗。

Communist leaders considered such programs absolutely essential for their new nation, citing their need to upgrade an infrastructure neglected by the tsars and keep up with the relatively advanced and increasingly hostile West.

共产党领导人认为，这种计划绝对必要的新的国家为由，他们需要提高的基础设施忽视了沙皇和跟上比较先进和日益敌视西方。

There were stragglers going by long after the regiment had passed-men who could not keep up with their platoons.

这一团兵开过好久后，一群跟不上队伍的散兵走过。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。