Slicing works by stating the starting index, the ending index, and an optional step size, all separated by semicolons.
分段的工作方式是声明开始索引、结束索引和一个可选的步骤大小，全部都用分号分隔。
The range method accepts a starting index, as well as a step size.
range方法接受起始索引以及步长。
Method accepts a starting index , as well as a step size.
方法接受起始索引以及步长。
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