This is because this time, the if statement on line 2 is now true, and "o" is simply returned. The recursion unwinds as follows.
这是因为这一次，第2行中的if语句现在为true，并且简单地返回了“ o ”。
And you can use letter collections (as you might in a regular expression), for example, to list the files with a "c" or "o" extension, as shown in Listing 2.
并且您可以使用字母集合(就像您可能在正则表达式中使用的那样)，例如，用于列出具有“c”或“o”扩展名的文件，如清单2所示。
This paper reports the synthesis of herbicide ofprimisulfuron-methyl, the method uses 2-amino-4,6-dihydroxylpyrimidine and O-chlorobenzoic acid as the raw materials.
本文主要报道了以2- 氨基-4， 6-二羟基嘧啶和邻氯苯甲酸为起始原料合成除草剂氟嘧磺隆，以及详细地介绍了各个中间体的合成方法。
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