即时制造是一种过程，它允许用减少库存和快速修正来解决质量问题，从而提高质量。
Just-in-Time manufacturing is a process allowing reduced inventory and rapid correction for quality problems, improving quality.
曲轴是发动机中关键零件之一，它的制造质量直接影响着发动机性能水平和安全可靠性。
The crankshaft is one of essential components in the engine, its manufacture quality is affecting the engine performance level and the security reliability directly.
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