But on the other hand, the use of over-fire air reduces the combustion efficiency of pulverized coal.

但另一方面，燃尽风的应用将导致煤粉燃烧效率下降。

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Fire from the natural gas well shot about one hundred forty meters into the air.

VOA: special.2009.03.22

He's got four essences: Earth, fire, water, air.

他认为世界有四大元素，土，火，水，气。

麻省理工公开课 - 固态化学导论课程节选

"As the engagement went on and the enemy continued with strong fire, air support was called for."

VOA: standard.2009.09.12

Plato believed that the first four corresponded to the elements of which the Greeks thought the material world was composed: fire, air, water and earth.

ECONOMIST: The shape of the universe

But the staff will always fire into the air first, to scare the bear away.

NEWYORKER: Stone Mattress

Despite coming under fire from the air, sea and land, they held out against a force of more than 3, 000 Germans for seven days.

BBC: Poland remembers World War start