如果您的意思是只想将原始图像保存到服务器，而不想让WP自动生成其他大小，那么有一个功能可以删除其他大小：

<?php
function wpse_remove_image_sizes() {
    // Remove the WP Core "thumbnail" size
    remove_image_size( \'thumbnail\' );
    // Remove a custom image size with the slug "custom-size-name"
    remove_image_size( \'custom-size-name\' );
    // Add any other sizes you need to remove -
    // this will depend on your theme and plugins.
}
add_action(\'init\', \'wpse_remove_image_sizes\');
?>