You can’t tell a book by its cover.Meaning: You cannot judge what something or someone is like by looking at the exterior.ប្រែ៖ អ្នកមិនអាចវាយតម្លៃរបស់អ្វីមួយឬក៏នណាម្នាក់ដោយមើលពីខាងក្រៅឡើយ។