地理试题难极了。
How they did on the exam: Hard to tell, they spilled coffee on the paper.
他们考得怎么样：难说，他们把咖啡泼卷子上了？
Although working very hard, he failed to turn in his research paper on time.
尽管他非常努力，但还是没能按时交上他的实验报告。
This paper introduces the application of the means of perturbation in hard spring system.
本文介绍了微扰法在硬弹簧系统中的应用。
With the help of the science and technology, glass can be made as hard as steel, or as soft as silk, or as light as paper, or as heavy as iron.
借助于科学技术，玻璃可以被制作的像钢一样硬，像丝一样柔，像纸一样轻，像铁一样重。
I'm working hard on my term paper. So please do not bother me tonight.
我正在努力写期末报告。所以今晚不要烦我。
Automatic test paper generation is a NP hard problem while restrictions exist.
试题库自动组卷问题是一个NP难题。
He fell upon the new idea and after a long time of hard work wrote an important paper on it.
他下苦功思考这一新观点，经过长时间的艰苦工作，写了一篇论文，对此进行阐述。
She' s working hard at her term paper.
她正在努力撰写学期论文。
If you press hard on the paper, you are probably a very emotional person.
如果你力度较重，你可能是个感情用事的人。
This paper introduced the meaning, characteristic and application of hard to machine...
本文介绍了难加工材料的内涵、性能及应用前景。
This paper introduced the meaning, characteristic and application of hard to machine...
本文介绍了难加工材料的内涵、性能及应用前景。
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