___的主要思想是将一个初始问分解成为比较小的、有着相同形式的子问,直到子问足够简单、能够被理解并解决为止,然后再将所有子问的解组合起来得到初始问的结果。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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