She has a lock but she bought another one as an additional insurance against thieves.
她有一把锁，但她又买了一把作为防范盗贼的另外一个保险措施。
I have one lock but I bought another as an additional insurance against thieves.
我有一把锁，可是另外又买了一把作为附加的防盗保障。
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。
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。
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