continuous thin line meaning in English

细实线

When the view cannot show the plane well , the plane symbol using two continuous thin lines as diagonals is used to indicate it , as shown in fig . 17
当回转体上图形不能充分表达平面时，可用平面符号表示该平面，如图17所示。
The view of symmetrical part can be drawn a half or quarter part , and two continuous thin lines paralleling to each other should be drawn on the two ends of the perpendicular center line , as shown in fig . 12
当机件上具有相同的结构要素（如孔、槽）并按一定规律分布时，只需要画出几个完整的结构，其余的可用细实线连接或画出他们的中心位置，并在图中注明其总数，如图12所示。