如果Content-Length头域(属于实体头)（见14.13节）出现，那么它的十进制值(以字节表示)即代表实体长度(entity-length)也代表传输长度(transfer-length)。
基于12个网页-相关网页
Entity Length 实体主体长度
The tee joint entity model has been chosen by the study of the influence of diameter of the branch pipe and the length dimension of the run pipe and branch pipe.
研究了不同支管管径、不同管长尺寸的影响，选择了三通实体模型；
The name of an entity (record) is used as an default search option in addition to the search key. The name is up to 60 characters in length.
实体(记录)除了搜索关键字以外被用作默认的搜索选项。这个名字可以多达60个字符组成。
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