Built on district difference of the area, the distribution character of elements of the air dust near the ground in different physiognomy cells, districts and their city zones is researched.是什么意思_Built on district difference of the area, the distribution character of elements of the air dust near the ground in different physiognomy cells, districts and their city zones is researched.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句