The three stages and four combinations are key to successful bilingual education.

双语教学的三个环节和四个结合是双语教学的灵魂和关键。

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The general thought of the construction is "One Transition, Two Wheel Drive, Three Stages and Four Combinations".

嘉兴构建低碳城市的总体思路是“一个转型、双轮驱动、三个阶段和四个结合”；

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Based on the problems we have to face in this period, this article discusses how to grasp and apply the principle of "four combinations" put forward by the central government.

针对后过渡期的应对问题，探讨了如何把握和应用好中央提出的“四个结合”原则的问题。

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The same four essential ingredients - flour,water,yeast and salt - can yield 10,000 different combinations.

VOA: standard.2010.07.16

Because it takes three units where there's only four choices at each position to have at least 20 unique combinations.

因为每个位点上仅有四种可能性,只有采用三个碱基一组,才能取得至少二十种不同的组合方式

耶鲁公开课 - 生物医学工程探索课程节选

How many combinations of codons are there if there's three bases and four possibilities at each base?

那密码子的组合方式到底有几种呢,三个位点,每个位点四种选择

耶鲁公开课 - 生物医学工程探索课程节选

Four of the options involve replenishing the beach and installing different combinations of groynes or, in one case, a rock revetment.

BBC: Clacton sea defence plan 'could cost ?27m'