1. I bought another lock as an additional insurance against thieves. 
   我又买了一把锁，以加强防贼的安全措施。
2. I bought another safety lock as an additional insurance against thieves. 
   ＂我又买了一把保险锁，以加强防贼的安全措施。＂
3. I buy some new lock as an additional insurance against burglary. 
   我买了一些新锁具以进一步防止盗窃。
4. East Scheldt Tide Lock 
   东斯海尔德挡潮闸
5. switch and lock movement 
   转辙装置

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• 1. 保险门锁
  insullac 绝缘漆...insurance lock 保险门锁...inswinging casement window 向内平开窗
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