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Fastness
01
速さ, 迅速さ
a rate (usually rapid) at which something happens
02
要塞, 砦
a strongly fortified defensive structure
03
固定性, 堅牢性
the quality of being fixed in place as by some firm attachment
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検索
速さ, 迅速さ
要塞, 砦
固定性, 堅牢性