1. a knockabout overcoat; a knockabout old car. 
   坚固的大衣；结实的旧汽车。
2. Strong and firm in construction; able to support weight or resist pressure; substantial 
   坚固的；结实的；可支撑重物的；耐压的；实在的
3. sturdy steel shelves; sturdy canvas; a tough all-weather fabric; some plastics are as tough as metal. 
   坚固的铁架子；结实的帆布；结实的全天候建筑物；有些塑料像金属一样坚韧。
4. Steel is stronger than iron. 
   钢比铁更坚固。
5. To make fast or secure. 
   使坚固或稳固

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• 1. firmness
  14. unison n. 一致，统一...15. firmness n.坚固，固定，稳定...16. abrupt a. 突然的，陡峭的
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• 2. tightness
  tightly 紧紧地...tightness 坚固...tightrope 拉紧的绳索
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• 3. induration
  indurated 硬化的...induration 坚固；变硬...Indusiisporites 小囊罗汉松粉属
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• 4. hardness
  hardness坚固
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