对于每个非空的变长字段，记录头使用一或两个字节包含了列的长度。

For each non-NULL variable-length field, the record header contains the length of the column in one or two bytes.

youdao

从设计角度来看，这使得factors方法变长了，但这避免了factors字段从方法中漏出。

From a design standpoint, it makes the factors method longer, but it prevents the factors field from "leaking out" of the method.

youdao

使用一系列固定格式的扩展头部取代了IPV 4中可变长度的选项字段。

Using a series of fixed format extension head replaced IPV4 variable-length options in the fields.

youdao

指明了如何解析可变长度字段，有效值被描述在表1。

Indicates how to interpret the variable length type field. Valid values are described in described in Table 1.

youdao

指明了如何解析可变长度字段，有效值被描述在表1。

Indicates how to interpret the variable length type field. Valid values are described in described in Table 1.

youdao