slack
(of a black hole) A region of around a black hole where photons travel in orbits around the singularity, just beyond the event horizon.
(organic chemistry, especially in combination) The tricyclic heterocycle that forms the basis of methylene blue and related dyes
Prior to distress.
(mining) Small coal; coal dust.
鉱夫たちはボイラーの燃料として、石炭の小片をトロッコに積み込んだ。
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