机车是铁路运输企业十分重要的可移动运输资源，铁路可变成本的很大部分就是由机车运用产生的。
Locomotive is one of the important movable transportation resources in railway enterprise, which contributes a lot to the variable cost of railway transportation operations.
竞争企业的短期供给曲线是边际成本曲线在平均可变成本曲线以上的那一部分。
The portion of the marginal-cost curve that lies above average variable cost is the competitive firm's short-run supply curve.
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