因为分类属性可以是多值的也可以是单值的，所以要用try - catch语句检查它。

Because the category property can either be multivalued or single-valued, you check for it with a try-catch statement.

youdao

因为分类属性可以是多值的也可以是单值的，所以要用try - catch语句检查它。

Because the category property can either be multivalued or single-valued, you check for it with a try-catch statement.

youdao