名词
中文翻译：燃料
同义词：
['preliminary filter', 'preliminary stage', 'preliminary treatment']
例句：
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1. The engine needs to be fueled before it can operate.
发动机需要加燃料才能运行。
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2. The preliminary stages of the project are crucial for success.
项目初期阶段对于成功至关重要。
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3.The preliminary results showed that the new treatment was effective.
初步结果显示，新的治疗方法是有效的。