这就是我最终使用的（所有感兴趣的人）：

    function override_tax_template($template){
        // is a specific custom taxonomy being shown?
        $taxonomy_array = array(\'tax1\',\'tax2\');
        foreach ($taxonomy_array as $taxonomy_single) {
            if ( is_tax($taxonomy_single) ) {
                if(file_exists(trailingslashit(get_stylesheet_directory()) . \'tax-template-directory/taxonomy-\'.$taxonomy_single.\'.php\')) {
                    $template = trailingslashit(get_stylesheet_directory()) . \'tax-template-directory/taxonomy-\'.$taxonomy_single.\'.php\';
                }
                else {
                    $template = BASE_PLUGIN_DIR . \'includes/tax-template-directory/taxonomy-\'.$taxonomy_single.\'.php\';
                }
                break;
            }
        }
        return $template;
    }
    add_filter(\'template_include\',\'override_tax_template\');