整批数量 round lot
·2,447,543篇论文数据，部分数据来源于NoteExpress
简单的项属性可以是基元数据类型，例如整数或字符串，或者是称为内容的特殊数据类型，这种数据类型用于存储诸如文件字节等批量数据。
Simple properties of items can be primitive data types, such as integers and strings, or a special data type called content, which is used to store bulk data such as the bytes of a file.
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