基本解释[机] 半圆锉词组短语短语middle half -round file 中半圆锉half -round d middle file 半圆中锉smooth half -round file 细半圆锉half-round file更多词组英英字典柯林斯英英字典 a file having a semicircular cross-section half-round file剑桥字典half-round file柯林斯字典专业释义机械工程半圆锉半元锉