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- difficult drilling formation 难钻进地层
- Research on New Type of Drilling Bits, Tools and Mud in Difficult Drilling Formations 难钻进地层用新型钻头、钻具及泥浆的研究
- Solid Expandable Tubular Technology Increases Production Rates in Difficult Drilling Environments,JPT, June 2002. 傅诚德著:《科学技术对石油工业的作用及发展对策》.;北京:石油工业出版社;1999
- The soldiers had to practice their drill formations daily. 士兵每天都进行队列训练。
- Cooperating with the hydrocarbon exploration in the East China Sea, we analyzed electrofacies in drilled formation in Sudi structural belt by using the models of identification . 配合东海油气勘探工作,用该识别模型对苏堤构造带的钻遇地层进行了测井相分析。
- The drilling troops mustered on the hill. 演习部队在小山上集合起来了。
- It must be difficult to play various personae in the same movie. 在同一个电影中扮演不同的角色肯定不容易。
- Navigation is difficult on this river because of the hidden rocks. 因为河上有暗礁，所以在这条河上航行很困难。
- The workman is drilling in the wall. 工人正在墙上打孔。
- It was difficult to tell his exact age. 很难判断他到底多大岁数。
- Drilling is cutting a hole with a drill. 钻削就是用钻头钻一个孔。
- It is difficult to express it in terms of science. 要用科学的字眼来表达它是很困难的。
- It was difficult to gauge how people would respond. 大家的反应如何难以估计。
- The noise of the drilling is intolerable. 钻孔的噪音让人受不了。
- She handled a difficult argument skilfully. 她巧妙地应付了一场艰难的辩论。
- He find it difficult to give shape to his idea. 他觉得很难把他的想法，明确表达出来。
- It is difficult to decide between the two opinions. 在这两种意见之间抉择是困难的。
- It is difficult to keep on terms with such a man. 很难和这样的人保持友好关系。
- It is difficult to stamp out all the crimes. 很难把所有的犯罪都消除掉。
- It's difficult raising a family on a small income. 依靠微薄的收入是很难养家的。
