be protected against

• 对 ... 作好戒备； 防止 ...

be protected against的用法和样例：

例句

1. Buying a house is the best hedge against inflation.
   购买房子是防止通货膨胀的最佳保障。
2. Antibiotic can be used against infection.
   抗菌素可以用来防止感染。