1.attack dog 警犬
 

例句:The officer’s attack dog has saved his life many times.
这位警察的攻击犬多次救了主人的命。
 

2.broken into 破门而入

例句:Someone has broken into our house.
有人闯入我们家了。

3.buff up 提高；擦亮
 

例句:Grind it using a fine emery paper or buff it up.
请用细砂纸或锉刀研磨，或者用拋光器磨光。
 

4.security door 防盗门

例句:With the security door so firm that nobody can break in.
防盗门这么结实，没有入能闯进来。