I have one lock but I bought another as an additional _____ against thieves.空空填什么

问题描述:

I have one lock but I bought another as an additional _____ against thieves.空空填什么

此为正
可以用 protection - 保护
precaution - 保护措施
但是这句后面用了against, 那就选protection, 因为一般用法是 protect XXX against XXX.
来自分类排名第一的英语牛人团,满意请采纳!

I have one lock but I bought another as an additioanl (one) against thieves.

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 have one lock but I bought another as an additional __one___ against thieves.