求翻译：If the cavity does not fill (short shot), changes must be made to the design, injection location, choice of plastic, or processing conditions. However, to ensure the finished part is of good quality, the cavity must also be adequately packed with plastic (see How plastic fills a mold). Therefore, you should ask the question, 'Can a good quality part be made?' and not just, 'Will the part fill?'.是什么意思？

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