middle half-round file中半圆锉
half-round smooth file半圆细锉
smooth half-round file细半圆锉
half-round bastard file粗齿半圆锯
half-round coarse file半圆粗锉
half-round d file半圆锉
half-round middle file半圆中锉
half-round d middle file半圆中锉
N（名词） a file having a semicircular cross-section 半圆锉 [engineering]