Disc cutter is an important tool of shield machine to crush the rock during excavating tunnel, crackingefficiency of it directly impacts on the construction efficiency.
盘形滚刀作为盾构掘进机在掘进过程中破岩的主要刀具，其破碎效率直接影响了地下工程施工的效率和成本。
2
The efficiency hawks, he said, emphasize standardized testing, cracking down on poor school management and purging bad teachers.
他谈到，强硬派强调的是标准化考试，取缔落后的学校管理，淘汰不合格的老师。
3
They have good heat transfer efficiency with better resistance to thermal cracking and chemical oxidation.