是个难题 - 翻译成英语

• is a problem
• is difficult
• been problematic
• been a challenge

在 中文 中使用 是个难题 的示例及其翻译为 英语

病虫害防治一直是个难题。
Fighting insects was always a problem.

但如何保护，依然是个难题。
But protection continues to be an issue.

但是如何协调和激励成千上万的员工是个难题。
But coordinating and motivating thousands of workers remained a challenge.

投资者的资金管理是个难题。
Local investor funding was challenging.

明年如何布局基金是个难题。?
As for next year's fondo challenge?

但对于投资者来说，报警是个难题。
However, for investors the problem is policymakers.

从几个方面看，青少年健康仍然是个难题。
Adolescent health also remains a challenge in several respects.

实时路况的检测，一直是个难题。
Testing real-time media has always been hard.

对克林顿来说，这是个难题。
And that's a problem for Clinton.

但如何跨越这一“死亡之谷”是个难题。
The challenge is to cross this“valley of death”.

此外，执行判决也一直是个难题。
Besides, execution of court verdicts also remains a problem.

在有些地区较小的人口聚居区提供保健服务是个难题，其原因是保健工作者的分布不均。
Provision of health care in small and scattered population concentrations is a problem in some areas due to the poor distribution of health workers.

做电源开发的人都知道，电源的低温启动是个难题。
Everyone who does power supply development knows that low temperature starting of the power supply is a problem.

他强调，在检测进行的同时，预防炭疽菌中毒是个难题。
He emphasised that, while tests are ongoing, preventing anthrax poisoning is difficult.

但是寻求一款准确度高、重复性好且坚固耐用的标准温度计一直是个难题。
But finding a reference thermometer that is accurate, repeatable and robust has been a challenge.

如何将这一切转变为强制、收买选票、政治性再分配计划等等肮脏勾当，对心怀不轨的撒谎耍赖者来说是个难题。
How all that gets translated into the dirty business of coercive, vote-buying, politically driven redistribution schemes is a problem for prevaricators with agendas.

但是，如何将黄金从这类矿石中提炼出来一直是个难题。
However, extracting gold from the ore produced by these mines has been a challenge.

例如，有效利用军事财产是个难题，因此我们欢迎人道协调厅委托开展的一项研究取得的结果。
The effective use of military assets is a challenge, for example, and we therefore welcome the results of the study commissioned by OCHA.

这是个难题，谜题通常一个问题会导致其他一些我觉得合乎逻辑的问题。
And here is a conundrum, a puzzle, and often one question will lead to other questions that seem logical to me.

制造排程是个难题，特别的在开放的、动态的环境下。
Introduction Manufacturing scheduling is a difficult problem, particularly when it takes place in an open, dynamic environment.