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For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.有关特定运算符的详细信息,包括语法和示例,请单击特定运算符转到其参考页面。
$all
$elemMatch
$size
For examples on querying array fields, see:有关查询数组字段的示例,请参阅: