It would be more efficient to burn better quality coal that left less ash, he said.

他表示燃烧优质且余烬少的媒会更有效率。

youdao

In most areas, the ash contains less uranium than some common rocks.

在大部分地区，浮尘含有的含有的铀比普通岩石中的含量还低。

youdao

But at a site 50km east of the eruption, 24% of the ash falling to the ground was in the form of particles 10 microns or less in size.

但在喷发地点东部50千米处，24%的落地灰尘颗粒却小于或等于10微米。

youdao

He tested the cement, and says less could be used because the rice hull ash makes it a stronger building material.

VOA: special.2009.12.01

Rajan Vempati thinks rice hull ash could help the concrete industry produce less carbon dioxide.

VOA: special.2009.12.01

It is less useful for ash which has yet to fall and instead is distributed, in clumps and layers, at various altitudes and thus in different wind conditions through a large patch of atmosphere.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The

Add to that the extraordinary talent in the kitchens of Dublin's Michelin-starred restaurants as well as in hole-in-the-wall cafes in the countryside, and you have nothing less than a culinary rebirth, a phoenix rising from the coal ash, deliciously.

WSJ: The New Green Cuisine

But at a site 50km east of the eruption, a quarter of the ash falling to the ground was in the form of particles of ten microns or less.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The