求翻译：　多年来，胶辊生产由于产品的不固定性、尺寸规格的多样性，使工艺设备的机械化、自动化成为难点，迄今为止，多数仍是以人工为主的间断式单元型作业生产线。是什么意思？

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　For many years, rubber roller production because the product is not fixed, dimensions of diversity, make mechanization and automation of the process equipment a difficulty, so far, most are still dominated by artificial interruption unit job production line.

Over the years, roller production due to product non-permanence, the diversity of sizes, making the process equipment, mechanization, automation is difficult, so far, most are still mainly based on intermittent artificial cell-based operating production line.