It's incredibly hard to maintain patience at all times with your children.

始终对孩子保持耐心是非常困难的。

youdao

It's hard to maintain competitive pricing.

很难保持有竞争力的定价。

《柯林斯英汉双解大词典》

These will be hard to maintain.

这些管线很难维修。

youdao

So there are various reasons why it's hard to maintain this collusive agreement.

这样的私下协议难以维系,是有多方面原因的

耶鲁公开课 - 博弈论课程节选

But he may find it hard to maintain harmony between factions as they draft a constitution.

ECONOMIST: Libya after Qaddafi

You've worked hard to maintain the partnership between the United States and Israel.

WHITEHOUSE: President Obama at 2012 AIPAC Policy Conference

Yes, political upheavals and natural calamities do affect us, but we continue to work hard to maintain our sales targets.

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