Most dogs will not attack unless provoked.
大多数狗受到挑衅才会攻击。
You should always watch out on those sleeping dogs. They may attack you anytime.
你早就应该看透他，你应该时时小心那些坏人，他们随时会攻击你。
A small number of pet dogs even attack people.
少数宠物狗甚至会袭击人。
Another study found that pet dogs can improve survival after a heart attack.
另一项研究发现，养宠物狗可以提高心脏病发作后的生存率。
Another study found that pet dogs can improve survival after a heart attack.
另一项研究发现，养宠物狗可以提高心脏病发作后的生存率。
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