注意：用两个命令，kbps值会计算在二层报头上。
Note: With both commands, the KBPS value should take the Layer 2 overhead into account.
定义了属性、项定义或项后，将会计算其值。
When a property, item definition, or item is defined, its value is evaluated.
定义了属性、项定义或项后，将会计算其值。
When a property, item definition, or item is defined, its value is evaluated.
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