Because internal quality and external quality are not the same things.
因为内部质量和外部质量并不是一回事儿。
Being rich is a very external quality.
富有是一种外在的特征。
The test laboratory quality control includes internal and external quality control method.
检测实验室质量控制分为内部质量控制和外部质量控制。
The test laboratory quality control includes internal and external quality control method.
检测实验室质量控制分为内部质量控制和外部质量控制。
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