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hardnessn.

英 'hɑːdnəs | 美 'hɑrdnɪs
中文n. [物] 硬度;坚硬;困难;冷酷
词根词源
hardness (n.)Old English heardnes; see hard (adj.) + -ness. Meaning "difficulty of action or accomplishment" is late 14c.
关键词
hardness