coal/kəʊl $ koʊl/

n. a hard black mineral that is dug out of the ground and burned as fuel; a piece of this

n. [U] 煤； [C] 煤块：Put more coal on the fire. 往火里再添些煤。

◇a lump of fire 一块煤

◇a coal mine 煤矿

◇a burning hot coal 燃烧着的热煤块

音组-oal/-əʊl $ -oʊl/

coal; goal

用法表示“煤”这种物质时为不可数名词，指煤块时为可数名词。