1. To make fast or secure. 
   使坚固或稳固
2. To make or become firm. 
   使稳定，使变坚固
3. Doubtful that the cord would hold, we strengthened it. 
   绳索恐怕不能支撑，让我们使它坚固一点
4. make firm or secure; strengthen. 
   使坚固或安全；强化。
5. treated so as to become resistant. 
   经过处理使之坚固耐久。

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• 1. indurate
  indurate vt 使坚固，变硬
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• 2. stablish
  stabling 马舍设备...stablish 使坚固...stably 稳定地
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• 3. ruggedize
  rugby n.橄榄球（赛）...ruggedize v.使坚固，使耐用...rumpus n.吵闹，喧闹
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• 4. stabilize
  ivory a.乳白色 n.象牙...stabilize vt.使坚固，使稳定...fishery n.渔业
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