guard against doing
?对不起重新纠正一下 guard against 防止, 防范 Please guard against pickpockets on the bus. 在公共汽车上要谨防扒手。 Yearly guardagainst famine; nightly guardagainst thieves年年防旱夜夜防盗 protect against 反对 ... 以保护如 Such guards also protectagainst fraying by roe deer. 这种保护措施还可防止獐鹿摩擦损伤。 It can be used for devising systems to protectagainst frost damage. guard against pride and rashness戒骄戒躁（习惯表达）
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