They provided against the attack.
他好准备以防受攻击。
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This is called " herd immunity" , which protects the people who get hurt easily, including those who can't be vaccinated for medical reasons, babies too young to get vaccinated, and people on whom the vaccine doesn't work.
这被称为 “群体免疫”,它保护那些容易受攻击的人,包括由于医学因不能接种疫苗的人,由于太小还不能接种疫苗的婴儿,以及疫苗在他们身上不起作用的人。