动词
中文翻译：阻止
同义词：
['guard against', 'prevent', 'defend against']
例句：
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1. We must take measures to prevent the spread of the virus.
我们必须采取措施防止病毒的传播。
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2. The police were called in to prevent a riot from breaking out.
警察被叫来防止一场骚乱爆发。
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3. To protect the crops, farmers need to guard against pests and diseases.
为了保护作物，农民需要防止害虫和疾病。