本文初步提出了局部网络的控制结构概念，以及有效位长度，无效位长度、视在位长度、位长度因素等概念。

A new concept of the control structure of the LAN is proposed primarily. And the concepts of effective and viewing bit length and bit length factor are proposed.

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一位女发言人说那个协议已被宣布为无效的。

A spokeswoman said the agreement had been declared null and void.

《柯林斯英汉双解大词典》

换句话说，购买订单中的条目如果Quantity元素是四位数字，则认为是无效的。

In other words, a purchase order containing a line item with a four-digit number in the Quantity element would be considered invalid.

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