additional insurance

漢語翻譯

例句：

1. I bought another safety lock as an additional insurance against thieves.
   ＂我又買了一把保險鎖，以加強防賊的安全措施。＂
2. I bought another lock as an additional insurance against thieves.
   我又買了一把鎖，以加強防賊的安全措施。