虚线的英文：
broken line
dashed

参考例句：

• In the diagram, the dotted line is the 60% relative humidity curve.
  图中的虚线表示60%相对湿度的曲线。
• If the line closest to the driver is broken, you are free to pass.
  要是虚线靠近驾驶者时，你就可以随意超车了。
• Position by aligning the slotted line to the hem or fold line marking. Fuse.
  以底边的虚线或直折线定位粘双面粘合衬。
• But was it a better indicator than, say, broken or wavy lines or any other kind of line, for that matter?
  但与其他线条相比，比如说虚线或者波浪线，它的动感效果就更好吗？
• The dashed lines on the rotors show the locations of the recesses and how deep they are.
  转子上面的虚线就示出了凹槽的局部位置及其深度情况。
• The small part which returns via an air path is called the leakage flu and is indicated by dotted lines
  一小部分经空气路径返回的磁通量，叫做漏磁通量，并用虚线画出。

broken是什么意思：
adj. 破碎的；坏掉的；被打断的；已骨折的；（线条）虚线的，断续的
v. break的过去分词

• This train staff lamp is broken.
  这个路签灯坏了。
• My damn car is broken！
  我的混帐汽车坏了！
• A threefold cord is not quickly broken.
  三股合成的绳子不易断。

line是什么意思：
n. 线条，界线，路线；条纹；排；铁路线；生产线；台词；态度；防线；前线
v. 用线标出，划线于；使布满纹络；加衬里于；排队，排列成行

• This is a lined trunk.
  这是一个有衬里的箱子。
• They are politically in line.
  他们在政治上意见一致。
• On a map there are horizontal lines and vertical lines.
  在地图上有水平的线和垂直的线。

dashed是什么意思：
n. 虚线，少量，少许

• Add a dash of balsamic vinegar.
  加入少许香脂醋。
• Put in just a dash of vinegar.
  稍许放一点点醋。
• They made a headlong dash for the door.
  他们迅猛地向门口冲去。