Especially during grade transition, a lot of off-specification polypropylene are produced and leads to loss of profits.

特别是在产品牌号切换过程中会产生大量的不合格料，带来了经济上的损失。

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Simulation results show that through implementation of optimal control, the transition time and off-spec product can be reduced over 60% in the polypropylene grade transition.

仿真结果表明，通过实施优化控制，能够使产品牌号切换过程的过渡时间和过渡料数量降低60％以上。

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Given all that's riding on having a successful ninth-grade experience, it pays to explore what can be done to meet the academic, social and emotional challenges of the transition to high school.

考虑到这一切皆依赖于成功的九年级经历，那么探索如何在高中过渡期应对学业、社会和情感方面的挑战将是很有价值的。

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Yet a child in the last grade of primary only has at best a 75% chance of making the transition to lower secondary school in about 20 countries around the world, the overwhelming majority of which are in sub-Saharan Africa.

UNESCO: EDUCATION

Since China's leadership transition last month, investors have demanded less additional yield on the lowest-rated investment-grade corporate bonds compared with government bonds.

WSJ: Faith in Bailouts Spurs China