Generally speaking, the coal of power plant is low-grade, high-ash (the low content of fixed carbon) and the effect of direct gasification is bad.
一般说来，电站煤质的品位低、灰含量高(低的固定碳含量)，直接气化效果很差。
2
The volcano spurted clouds of steam and ashhigh into the air.
火山把团团热气和灰尘喷向高空。
《牛津词典》
3
Reasons to worry: Merapi is capable of producing a Plinian eruption (spewing at least 1 cubic kilometer of magma and producing 20 to 50 kilometer-highash columns)every 1,000 years or so.