Just add a binary to the declaration as shown on line 20.
只需要向声明中添加一个binary，如20行所示。
The selector and declaration are positioned on the same line, as shown.
选择器和声明位于同一行上，如下所示。
The encoding declaration must appear on a line of its own.
编码声明必须在它所在位置的的一行内。
The encoding declaration must appear on a line of its own.
编码声明必须在它所在位置的的一行内。
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