Troops have been sent to protect aid workers against attack.

已经派出部队保护援助工作人员免遭袭击。

《牛津词典》

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At the end of the day, these kinds of systems are primarily designed to protect against the sort of opportunistic smash-and-grab attack that makes up the majority of burglaries.

归根结底，这类系统主要用于防止投机取巧的砸橱窗抢劫袭击，大部分的入室盗窃都属于这类袭击。

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In patients, the bodys natural defenses against disease seem to attack the person they are supposed to protect.

VOA: special.2010.03.16

Mr Ferrante and Mr Auriemma said players could protect themselves against potential attack by stopping Origin launching games via desktop shortcuts.

BBC: Players at risk from game store hack attack

It is designed to protect members against physical attack.

ECONOMIST: Cyberwarfare

The effect of project delays was underlined this week in a report from the National Audit Office which revealed that the first three new Type 45 destroyers will enter service without sonar defences to protect them against submarine attack.

ECONOMIST: Public investment