Disc cutter is an important tool of shield machine to crush the rock during excavating tunnel, cracking efficiency 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。

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Historically, antitrust enforcers tried to shield competitors from market-dominant companies that could crush them through price cutting, intimidation of suppliers, or other dubious tactics.

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