vent to anal fin length Straight line distance from posterior edge of the vent (anus) to the anterior origin of the anal fin or anal fin anlage.是什么意思_vent to anal fin length Straight line distance from posterior edge of the vent (anus) to the anterior origin of the anal fin or anal fin anlage.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句