持续几十年的挑战之一是难于找到多型腔模具来生产一模一样的部件。
One that has persisted for years is the difficulty of getting multicavity tools to produce identical parts.
持续几十年的挑战之一是难于找到多型腔模具来生产一模一样的部件。
One that has persisted for years (decades, actually) is the difficulty of getting multicavity tools to produce identical parts.
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