| 标题 | difficult problem可数吗 |
| 范文 | How to improve the quality of products was a difficult problem to him. 如何提高产品质量对他来说可是个难题。 She is working at a difficult problem in mathematics. 她在做一道数学难题。 How to grow rice in a dry area is a difficult problem. 在干旱地区种水稻可是一个难题。 When you come across a difficult problem, think about it by yourself first. 遇到难题的时候先自己想想。 The student decided to work out the difficult problem by himself. 这个学生决心独自解决这道难题。 Air pollution is a difficult problem for environmental protect. 城市大气污染问题是环境保护的一项难题。 上一篇：not only后面加什么句子 下一篇：得意忘形是褒义词还是贬义词还是中性词 |
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