动词
中文翻译：保护
同义词：
['protect', 'defend', 'secure', 'safeguard']
例句：
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1. The soldiers guarded the border against intruders.
士兵们守卫边境，防止入侵者。
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2. He guarded his secret well and never revealed it to anyone.
他保守秘密很好，从未向任何人透露。
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3. The guards stood watch over the prisoner.
守卫站岗监视囚犯。