The mantle, which secretes the shell, is the dorsal body wall covering the visceral mass.The mantle cavity is lateral and in most bivalves, the gills have a respiratory and digestive function.是什么意思_The mantle, which secretes the shell, is the dorsal body wall covering the visceral mass.The mantle cavity is lateral and in most bivalves, the gills have a respiratory and digestive function.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句