燃煤锅炉是用煤大户，年耗煤量约为国家年产量的1／3左右。

As a big coal consumer, coal-burning boiler consumes about 1/3 of annual coal output each year in our country.

youdao

燃煤锅炉是用煤大户，年耗煤量约为国家年产量的1／3左右。

As a big coal consumer, coal-burning boiler consumes about 1/3 of annual coal output each year in our country.

youdao