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The attribute name is case-sensitive, and its data type should be an integer.
属性名称有大小写的区别，且数据类型应为整数。
youdao
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The step attribute, when present, must also have an integer value.
当出现step时，它也必须是整数值。
youdao
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The step attribute, when present, must also have an integer value.
当出现step时，它也必须是整数值。
youdao