Birds are also at risk for lung cancer, as well as pneumonia, because their respiratory systems are hypersensitive to any type of air pollutant.是什么意思_Birds are also at risk for lung cancer, as well as pneumonia, because their respiratory systems are hypersensitive to any type of air pollutant.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句