visible line meaning in English

可见谱线
外形线

187 there are various types of lines on the drawing such as : border lines , visible lines , invisible lines , break lines , phantom lines
图上有各种形式的线条，诸如：边框线、实线、虚线、剖面线、中心线、引出线、尺寸线、断裂线、假想线。
187 there are various types of lines on the drawing such as : border lines , visible lines , invisible lines , break lines , phantom lines
图上有各种形式的确是的线条，诸如：边框线、实线、虚线、剖面线、中心线、引出线、尺寸线、断裂线、假想线。