guard against something phrasal verbphr v PREVENTto prevent something from happening 防止…发生 Exercise can guard against a number of illnesses. 运动可预防许多疾病。
guard against doing something Nurses should guard against becoming too attached to their patients. 护士应该避免对病人产生过多的感情纠葛。
→ guard against something at guard2(1)