By the end of the Song Dynasty, the Chinese invented multiple-stage rockets.

到宋朝末期，中国人发明了多极火箭。

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The optimization problem was formulated as a multiple-stage optimal control problem and solved by a forward and backward iteration loop.

整个最优化问题被描述成一个多阶段系统优化控制问题，通过一个向前和向后的迭代循环解决。

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The decolorization ratio of syrup in sulfitation process is higher through experiments with multiple-stage flotation of syrup than that with single-stage flotation.

实验证实，糖浆多级上浮清净法比普通单级上浮法更能使亚法糖浆获得较高的脱色率。

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Warrell says that Erbitux's troubles validate his more conservative approach to testing Genta's Genasense drug, now in final-stage testing for melanoma, lymphoma and multiple myeloma.

FORBES: Magazine Article

Those ready to update should peep the Zune desktop software, although Nokia cautions not everyone will will get updated today, as coordinating across multiple carriers in different markets is like "herding sheep, " resulting in a multi-stage rollout in the coming four weeks.

ENGADGET: Nokia's Lumia 800 firmware update juices handsets, banishes battery issues