名词
中文翻译：机车队
同义词：
['locomotive squadron', 'locomotive train例句：1. The engineers were busy inspecting the locomotives before the race.（在比赛前，工程师们忙于检查机车。）']
例句：
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1. The engineers were busy inspecting the locomotives before the race.
在比赛前，工程师们忙于检查机车。
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2. The locomotives have been upgraded to improve efficiency.
这些机车已经升级以提高效率。
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3. The locomotives are essential for transportation in large cities.
机车对于大城市的交通至关重要。