hardnessKK [ˋhɑrdnəs] /ˈhɑɹdnəs/發音名詞1硬度、堅硬Diamond is famous for its extreme hardness and durability.鑽石以極高的硬度和耐久性著稱。2硬度指水質The hardness of the tap water here ruins our kettles.這裡自來水的硬度很高,把我們的熱水壺都弄壞了。3困難、艱難Nobody warned us about the hardness of the climb ahead.沒有人事先提醒我們接下來這段攀登有多艱難。4嚴厲、冷酷There was a hardness in her voice that silenced everyone.她語氣中的冷酷讓所有人都沉默了。