parrot coal
present participle of cross-check
A shape composed of three equilateral triangles arranged in such a manner that a fourth triangle of identical size, but pointing the opposite direction, could fit between them.
simple past tense and past participle of nitrocarburize
(UK, Scotland, dated) cannel coal
その博物館は、かつて村のランプを灯すために使われたカンネル炭の塊を展示していた。
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