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nature (of a person); disposition; temperament; character
quality; inherent characteristic; property; nature; (chemical) behavior
彼女はとても優しい性質だと評判だ。
She has a gentle nature.
この材料は特殊な性質を持つ。
This material has special properties.
この素材は水を弾く性質がある。
This material has the property of repelling water.