与基元数据类型相比，对象通常更大，处理速度也会有些慢。

Objects typically are larger and somewhat slower to process than primitive data types.

youdao

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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类型可以是基元，如字符串(SDO称它们为“数据类型”，并定义了一个映射到php类型的集合)或复杂类型来代表序列或地址(SDO称它们为数据对象类型)。

Types can be primitives, such as string (SDO calls these "data types" and defines a set mapped to PHP types), or complex types to represent an order or address (SDO calls these data object types).

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