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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.
在同一个滤波器中同时使用源端负载端耦合和多模腔融合技术，使滤波器的频率选择斜率和阻带性能得到改善。
The slope selectivity and the stopband of the filters are further improved by utilizing a combination of source-load coupling and over-moded cavities in the same filter.
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