{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/4\/47\/Restore-a-Whiteboard-Step-4.jpg\/v4-460px-Restore-a-Whiteboard-Step-4.jpg","bigUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/4\/47\/Restore-a-Whiteboard-Step-4.jpg\/v4-760px-Restore-a-Whiteboard-Step-4.jpg","smallWidth":460,"smallHeight":306,"bigWidth":760,"bigHeight":506.31868131868134}4擦拭干净。