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- vi. 变硬，变坚固；变坚强；变冷酷
- vt. 使…变硬；使…坚强；使…冷酷；使…麻木不仁
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1. These minerals form crystals and harden the plaque structure.
这些矿物质形成了菌斑的结晶变硬的结构。
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2. Calculus — If left alone long enough, plaque begins to mineralize and harden into calculus or tartar because the plaque absorbs calcium, phosphorus and other minerals from saliva.
牙结石 — 如果菌斑呆的时间足够长，它就开始矿化变硬形成牙石或牙垢，因为菌斑从唾液中吸收了钙，磷和其他 矿物质。
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3. The carbon matting, drenched in resin, is compressed into a mold to harden it.
这种碳垫子，还是树脂制品时就弄湿了，得压缩成型使其变硬。
hard·en / ˈhɑːdn ; NAmE ˈhɑːrdn / verb 1 [intransitive , transitive ] to become or make sth become firm, stiff or solid （使）变硬，硬化 ◆ The varnish takes a few hours to harden. 清漆需要几个小时才能干透。 hardensth ◆ a method for hardening and preserving wood 硬化和保存木料的方法 2 [intransitive , transitive ] if your voice, face, etc. hardens,or you hardenit, it becomes more serious or severe （使声音、面孔等）更严肃，更严厉 ◆ Her face hardened into an expression of hatred. 她的脸沉下来，面带恨意。 hardensth ◆ He hardened his voice when he saw she wasn't listening. 看到她没在听他讲话，他声音严厉起来。 3 [intransitive , transitive ] if sb's feelings or attitudes hardenor sb/sth hardensthem, they become more fixed and determined （使）更坚定，更强硬 ◆ Public attitudes to the strike have hardened. 公众对这次罢工所持的态度已强硬起来。 ◆ Their suspicions hardened into certainty. 他们由怀疑变成肯定。 hardensth ◆ The incident hardened her resolve to leave the company. 这件事使她更加坚定了离开公司的决心。 4 [transitive , usually passive ] hardensb/sth/yourself to make sb less kind or less affected by extreme situations 使变得无情；使不被打动 ◆ Joe sounded different, hardened by the war. 乔让人觉得变了，因战争变得冷酷无情了。 ◆ They were hardened criminals (= they showed no regret for their crimes). 他们都是死不悔改的罪犯。 ◆ In this job you have to harden your heartto pain and suffering. 做这项工作面对伤痛和病患时你得保持沉着冷静。 ▶ hard·en·ing / ˈhɑːdnɪŋ ; NAmE ˈhɑːrdnɪŋ / noun [uncountable , singular ] ◆ hardening of the arteries 动脉硬化 ◆ a hardening of attitudes towards one-parent families 对单亲家庭态度的冷漠化 harden hardens hardened hardening hard·en / ˈhɑːdn ; NAmE ˈhɑːrdn / hard·en·ing / ˈhɑːdnɪŋ ; NAmE ˈhɑːrdnɪŋ /
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