Two big dogs guard the farm against strangers.
两条大狗保卫着农场，防备陌生人。
They kept a big dog to guard the house.
他们养了一条大狗守门。
Soon after the match resumed, his opponent made a big mistake: he dropped his guard.
比赛重新开始不久，他的对手犯了一个致命错误：他疏于防守，门户大开。
Soon after the match resumed, his opponent made a big mistake: he dropped his guard.
比赛重新开始不久，他的对手犯了一个致命错误：他疏于防守，门户大开。
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