judging by/from somethingGUESSused to say that you are making a guess based on what you have just seen, heard, or learned 依据某事〔所见、所闻或所学〕来判断 Judging by his jovial manner, he must have enjoyed his meal. 从他愉快的样子来看，他这顿饭肯定吃得很开心。
Judging from what you say in your letter, you don’t sound well. 根据你来信中所写的情况来看，你好像不大好。
judging by/from something• I'd say she's pretty rich, judging from her clothes.
→ judging by/from something at judge2(1)