特定数据类型的字段宽度，比如用四位数字表示年份。

Field widths for specific data types, such as four digits for a year.

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对于ITUT_14位实施，该字段必须保留空值。

For ITUT_14 bit implementations, this field must be left blank.

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如果字段是值类型的，则对该字段执行逐位复制。

If the field is a value type, a bit-by-bit copy of the field is performed.

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如果字段是值类型的，则对该字段执行逐位复制。

If the field is a value type, a bit-by-bit copy of the field is performed.

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