quaternion
A brominated flame retardant which belongs to the group of polybrominated diphenyl ethers.
plural of Assadist
plural of Zhuo
A group or set of four people or things. / A word of four syllables.
展示を設営するために、四人組のボランティアが早めに到着した。
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DiQt
Free
★★★★★★★★★★