Four prerequisites are requested to satisfy laser selective cooling.

提出了实现激光选择性冷却须满足的四个条件。

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These are called the four prerequisites of a red-black tree. Figure 4 shows an example of a red-black tree.

这些称为红黑树的四个先决条件。

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To accomplish the three major tasks I have outlined for the 1980s and to ensure the four prerequisites for modernization will take strenuous effort.

上面说的八十年代的三件大事和四个前提，任务都是很繁重的。

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