扁圆头螺栓 button head bolt: 圆头螺栓round head button bolt: 圆头螺栓button head: 半圆头; 扁圆头; 圆头的button-head: 半圆头的; 圆形端头bolt head: 螺栓头; 枪栓头下载手机词典可随时随地查词查翻译
