当从原始的输入数据中提取字符串时，试着从原始字符串返回一个子字符串，而不是创建一份拷贝。

When extracting strings from a set of input data, try to return a substring of the original data, instead of creating a copy.

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LOCATE LOCATE (' beach '，p. d escription)返回一个子字符串在搜索字符串中第一次出现的起始位置，如果没找到子字符串，则返回0。

LOCATE LOCATE (' beach ', p.description) Returns the starting location for the first occurrence of a substring in a search string, or zero if the substring isn't found.

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然后，split方法返回一个数组，其中保存了根据空格字符将给定字符串分割成子字符串的结果。

The split method then returns an array holding the strings that resulted from separating the given string into substrings, as delimited by the space character.

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