{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/0\/02\/Type-on-a-PDF-Step-2-Version-3.jpg\/v4-460px-Type-on-a-PDF-Step-2-Version-3.jpg","bigUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/0\/02\/Type-on-a-PDF-Step-2-Version-3.jpg\/v4-760px-Type-on-a-PDF-Step-2-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":760,"bigHeight":570}2在程序右边,点击“工具(Tools)”。后点击“内容(Content)”打开面板。