But the US initially had a hard time keeping track of their nemesis.

但美国最初很难追踪他们的对手。

Caregivers often have a hard time keeping up with all the medical information.

护理者通常要下很大的劲才能掌握所有的医疗信息。

MacGuineas says whoever wins the presidency will have a difficult time keeping campaign promises.

麦克基尼表示，无论谁赢得总统选举，履行其竞选承诺皆非易事。

People also have an easier time keeping their distance from others in outdoor areas.

人们在户外也更容易与他人保持距离。

Even on two incomes, we're having a hard time keeping up with our bills.

即使有两份收入，我们也很难跟上我们的账单。

There are 3 main reasons why we have such a hard time keeping these resolutions.

为什么我们很难坚持这些计划，主要有三个原因。

Which means the time keeping on Mars is actually somewhat close to what it is on earth.

这意味着火星上的记时实际上和地球上的记时很接近。

Lopez had been having a hard time keeping up with monthly rent payments in an earlier apartment.

洛佩兹很难支付之前一套公寓的月租金。

Businesses are having a hard time keeping up with demand, so they're raising their prices, and hiring has gotten difficult.

企业很难跟上需求，所以他们提高了价格，而且招聘也变得很困难。

But it's not so much the time keeping aspect.

但这并不是时间保持方面。