英语语法分析

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。

The balance of the multicavity unbalancing injection system has great influence on the quality of the parts.

注塑工艺中多型腔非平衡浇注系统的平衡状况，在很大程度上影响制品的质量。

One that has persisted for years (decades, actually) 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。