至于缺点，它需要一个特别的喷嘴和挡圈来容纳材料的回退。
As for disadvantages, it requires a special nozzle and check ring to accommodate material coming back into the injection unit.
至于缺点，它需要一个特别的喷嘴和挡圈来容纳材料的回退。
As for disadvantages, it requires a special nozzle and check ring to accommodate material coming back into the injection unit.
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