Many of the hotels are located in cities where air pollution is a major concern, resulting in dirty ceiling, etc. Where air filtration is unsatisfactory.是什么意思_Many of the hotels are located in cities where air pollution is a major concern, resulting in dirty ceiling, etc. Where air filtration is unsatisfactory.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句