白痕
- 网络White mark;blank trace
白痕-
有的图片上会有个白痕，那是玻璃反光造成的。
Some pictures have a white mark , it is the reflective glass .
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突然失去血流会使臂上出现白痕。
The white line that appears is caused by a sudden loss of blood .
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移开直尺几秒钟后，血管会再次充血，白痕就会变成红色。
A few seconds after you remove the ruler , the vessels will once again fill with blood and the line will turn red .