They tested mice with and without a type of white cell in the lining of the lung known as alternatively activated macrophages, a part of the innate immune system.是什么意思_They tested mice with and without a type of white cell in the lining of the lung known as alternatively activated macrophages, a part of the innate immune system.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句