拿一大一小两只碗，想办法固定一下相对位置，在大碗之内小碗之外装上水，放冰箱里冻实了，然后取出来，把两只碗拿掉，一个完全 DIY 的真冰保鲜碗就做好了。
译文:
Ice Preservative Bowl
Prepare two bowls, one big and one small. Try to fix them in their relative position. Fill water in between them, and then put them into the refrigerator. After freezing them, take them out ,and take the two bowls away. Then, an ice preservative bowl has been finished.