Array
(
    [post_type] => duan
    [tax_query] => Array
        (
            [0] => Array
                (
                    [taxonomy] => project
                    [field] => term_id
                    [terms] => 9
                )

        )

)

Array
(
    [post_type] => duan
    [tax_query] => Array
        (
            [0] => Array
                (
                    [taxonomy] => project
                    [field] => term_id
                    [terms] => 3
                )

        )

)

Array
(
    [post_type] => duan
    [tax_query] => Array
        (
            [0] => Array
                (
                    [taxonomy] => project
                    [field] => term_id
                    [terms] => 21
                )

        )

)