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。

And Michelle had been having a hard time keeping up.

而米歇爾一直難以跟上。

It's about speed, reaction, time keeping momentum and line work.

这是关于速度、反应、时间保持动力和线路工作。

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。

Now we are exposed to more light for longer periods of time, keeping our bodies awake longer.

现在我们暴露在更多光线下的时间更长，让我们的身体保持清醒的时间更长。

The depressed person often has a hard time keeping their train of thought, and struggles with finishing tasks affecting their grades or work performance.

抑郁的人往往很难保持他们的思路，并努力完成影响他们的成绩或工作表现的任务。

They either are faster than you and you have a hard time keeping up, or they're slower than you and you can't really run.

他们要是跑的比你快，你就要很费劲地去跟，他们要是跑的比你慢，你就没法跑了。

" We have a lot of homeless people here, " she said. " We're having a hard time keeping the receipts on the wall" .

" 我们这里有很多人无家可归。我们很难把收据维持在墙上。"

Some people are able to juggle three, four, or five tennis balls at the same time, keeping them all up in the air.

有些人可以同时玩弄三个、四个或五个网球，让它们都悬在空中。

Flatten the curve means that if we practice social distancing we can control the spread of the virus over time, keeping hospitals from being overwhelmed and saving lives.

平缓曲线代表如果我们实施社交距离，就可以控制病毒的传播，让医院不会过于忙碌，进而拯救人命。

The reason you'd have such a hard time keeping your head above the surface is due to the liquid methane and ethane found in Titan's lakes.

你很难将头保持在水面之上的原因是泰坦湖中发现了液态甲烷和乙烷。