You know better than to do that!
你明知道不应该那么做！
I wish he had acted differently. He certainly knew better!
我希望他有不同的表现，他知道该做什么。
know-how
英英释义： understanding of how a task should be done
英汉解释：实际知识；技能；诀窍
例句：
I’d call technical support and ask someone with the know-how。
我要打技术支持电话问个明白人。
Do you have the know-how to upgrade our servers?
你有升级我们服务器的能力吗？
know the tricks of the trade
英英释义： possess the skills and knowledge to be successful in a particular task
英汉解释：了解在特殊领域成功的能力和诀窍
例句：
Let’s ask Tom. He knows all the tricks of the trade。
咱们去问问汤姆吧，他知道这里面的门道。
I think we need to bring in a specialist who knows the tricks of the trade。
我觉得我们需要引进以为懂行的专家。
know one’s ABCs
英英释义： to understand and be capable of doing the basics
英汉解释：了解基本知识。
例句：
I don’t think he should do this. He doesn’t even know his ABCs。
我认为他不应该做这个，他对此一无所知。
Do you know the ABCs of programming?
你了解编程的基础知识吗？
know someone or something like a book
英英释义： completely understand someone or something
英汉解释：完全了解某人或者某事
例句：
She knows Jerry like a book。
她非常了解杰瑞。
I think Peter knows the Johnson account like a book. Ask him。
我觉得皮特非常了解约翰森会计师事务所，去问问他吧。
Definition: be able to recognize someone
英汉解释：能认出某人
know sb by sight
例句：
I know Peter by sight. I’ll got to the airport。
我能认出皮特，我要去机场啦。
Do you know Mary by sight?
你能认出玛丽吗？
know something from memory
英英释义： have something memorized
英汉解释：凭记忆知道……
例句：
She knows the piece from memory。
她零星有点印象。
Can you sing "New York, New York" from memory?
你能凭记忆唱出《纽约，纽约》这首歌吗？
know the ropes
英英释义： know how to do something
英汉解释：掌握诀窍，知道内情。
例句：
We need to bring somebody in who knows the ropes。
我们应该找个知道内情的人。
I’ve never used Linux so I really don’t know the ropes of installation。
我从没用过Linux系统，所以我真不知道这个应该怎么安装。
know the score
英英释义： understand the facts about a situation
英汉解释：知道一件事情的真相，深知其害
例句：
I know the score. Don’t try to fool me。
我知道事情的真相，别想糊弄我。
Please stop making excuses. I know the score and I know you are to blame。
别找借口了，我知道是怎么回事，我也知道这件事应该怪你。