名词
中文翻译：火车头组
同义词：
['locomotive set', 'locomotive assembly', 'locomotives']
例句：
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1. Theengineers assembled the new locomotives for testing.
工程师们组装了新的机车进行测试。
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2. The locomotives are essential for transporting goods across long distances.
机车对于长途运输货物至关重要。
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3.The locomotives were designed to be more fuel-efficient than their predecessors.
这些机车的设计比它们的前辈更节能。