青云翻译

Lanzhou city from early November into the heating period, coal release large amounts of sulfur dioxide, serious air pollution. The spring pollution is mainly caused by dust storms.

Lanzhou city from early November to the heating period, coal releases large amounts of sulfur dioxide, serious air pollution. Pollution is mainly caused by sandstorms in the spring.

The Lanzhou city enters the heating time from the beginning of November, the coal-burning releases the massive sulphur dioxide, serious air pollution.But the spring pollutes mainly is the sand storm causes.

From early November to Lanzhou City central heating, coal, sulfur dioxide released 2 serious air pollution. The spring pollution is mainly caused by dust storms.

Lanzhou city from early November to the heating period, coal releases large amounts of sulfur dioxide, serious air pollution. Pollution is mainly caused by sandstorms in the spring.