每个元素可以由一个以逗号分隔开的列表组成，或者由一个用连字符连接的范围组成，或者单独由一项组成。

Each element can consist of a comma-delimited list, a hyphenated range, or a single entry.

youdao

每个元素可以由一个以逗号分隔开的列表组成，或者由一个用连字符连接的范围组成，或者单独由一项组成。

Each element can consist of a comma-delimited list, a hyphenated range, or a single entry.

youdao