double punch and blank-column detection双重: double; dual; twofold; dupli ...打孔: punch a hole及: reach; come up to空白: blank space; gap; margin行: go下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:双重打孔及空白行检测，即可在微信中查询翻译
