Waterproof and breathable polymer film and coatings are permeable to water vapour molecules and not to permit water droplets to penetrate through them.是什么意思_Waterproof and breathable polymer film and coatings are permeable to water vapour molecules and not to permit water droplets to penetrate through them.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句