it is easy to find a stick to beat a dog
英文释义：if you want to abuse a person,you will easy find something to blame
例句：You do not like Walter,so you complain of his untidiness;well,it is easy to find a stick to beat a dog.
still waters run deep
英文释义：a person who is quiet and says little often hides deep feelings or a lot of knowledge of a subject
例句：Shallow streams make most din；still waters run deep.