cost ash的用法和樣例：
例句
- Billions of gallons of coal ash, of course, spill through this area after a broken dam occurred in Knoxville last week.
上周諾克斯維爾一個(gè)水壩毀壞，數十億加侖的煤灰傾瀉到這個(gè)區域。 - She spent her days hunting in the ash heaps for half-burnt coal-balls to take home for fuel.
她整天在煤灰堆撿煤核，拿回家去燒。
