但随着作业难度的加大，具有成长型思维模式的学生表现出了更强的毅力。
But as the work became more difficult, the students with a growth mind-set showed greater persistence.
该工程具有作业难度大、技术含量高、特种施工专业性强等特点。
The project has some characteristics of difficult construction, high technical contents, strongly professional special construction etc.
水平井单项作业难度较小，风险也较小，但施工周期长，费用大。
Single operation in horizontal well has only difficulty and low risk, but it takes long time and high cost.
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