名词
中文翻译：预备火
同义词：
['preparatory device', 'preliminary fire']
例句：
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1.The firefighters were preparing a preparatory fire to extinguishthe blaze.
消防员正在准备一个预备火来扑灭大火。
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2. Duringthe test, the students had to usetheir preparatory fires effectively.
在测试中，学生们必须有效地使用他们的预备火。
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3. The pilot was instructed to preparea preparatory fire before landing.
飞行员被指示在着陆前准备一个预备火。