他手臂上有一道事故留下的难看疤痕。

He has an ugly ___scar on his arm from the accident.

那次烧伤会留下一道难看的疤痕。

That burn will leave a nasty ___scar.

大卫脖子上有一道旧伤留下的疤痕。

David has a ___scar on his neck from an old injury.