additional insurance

汉语翻译

例句：

1. 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。＂
2. 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。