tiny coal

• 煤粉

tiny coal的用法和样例：

例句

1. He carried out trial runs using rockets stuffed with coal dust.
   他用填满煤粉的火箭式烟火装置来进行试验。
2. Experiments on coal reburning were carried out on an entrained flow reactor.
   在煤粉携带炉上进行再燃实验。