In the oil combustion, using top gun, the upper wind at a heat load of boiler blower gathered, part of the furnace temperature is high, reaching the ash melting point, resulting in boiler coking.

在投油稳燃时，运用上层油枪，使得上层一次风处热负荷会集，锅炉鼓风机部分炉温高，到达灰熔点，致使锅炉结焦。

youdao

We drift along the creeks of the tranquil upper reaches of the Noosa River, the low hum of the diesel engine a backing to the sounds of wind and lapping water.

游艇沿宁静的小溪终于进入了努萨河，发动机的低鸣与风声水声交杂相映。

youdao

That is the usual upper limit of the noise of wind rustling through bushes and of the murmurs of an audience, which might have drowned the actors out.

这是风吹过灌木或者一位观众窃窃私语所发出声音频率的上限，通常就是因为这些声音会将表演者的声音淹没。

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"I think we're going to get the upper level winds carrying that ash down for a few more days yet until the upper wind patterns change which will probably not happen until the time frame Thursday-Saturday.

VOA: standard.2010.04.17

But in the upper Midwest, lots of wind comes on the grid.

WSJ: Dominion Resources Chief Seeks Coordinated U.S. Energy Policy

Wind works very well in the upper Midwest, Texas.

WSJ: Dominion Resources Chief Seeks Coordinated U.S. Energy Policy

The planet and its neighbours are bathed in the solar wind, a stream of charged particles ejected from the upper atmosphere of the sun.

ECONOMIST: Climate change: Bubbling up | The