The problem about mechanical efficiency of tackle-block is the key point in junior high school mechanics and also the difficult point.

滑轮组机械效率问题是初中力学中的重点，也是初中力学解题的难点。

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Hence, another key problem LTCC technology studies needs to tackle is to develop more efficient optimization methods whose target is to shorten the design period of LTCC circuits.

因此，研究具有针对性的高效优化方法，缩短LTCC电路设计周期，是当前LTCC技术研究的另一个重要内容。

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During the doing phase, the project office tackle the key problem which is no any mature process.

在实施阶段，针对产品实现过程中的“短板”环节，成立了项目组，在无成熟工艺的条件下，进行工艺攻关。

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