性質， せいしつ
1. nature (of a person), disposition, temperament, character
2. quality, inherent characteristic, property, nature, (chemical) behavior
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小学校のときから、酸性・アルカリ性という性質をリトマス紙で調べたりしてきていますね。
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Since primary school we've been checking for the qualities known as acidity and alkalinity with litmus paper.
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ある人物が不変の性質で全人生を貫くということは小説の中だけの話だ。
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Only in novels do you find individuals who live out their whole life with unvarying character.
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ゼラチンは、冷えると固まる性質があります。
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Gelatine has the property of setting as it cools.
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油は水に浮く性質がある。
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Oil floats on water.
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彼女はおとなしい性質だ。
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She has a gentle disposition.
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彼は性質が頑固だ。
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He is obstinate in disposition.
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彼は人懐っこい性質だ。
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He has a friendly nature.
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彼は何かをやり出すとそれに凝る性質です。
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When he begins to do anything, he devotes himself to it.
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彼はとても優しい性質で、大きな声を出すのも聞いたことがない。
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He is so mild in disposition that I have never heard him speak in a loud voice.
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彼はこっけいな性質の人だ。
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He is of a humorous turn of mind.
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