"what one doesn't know won't hurt one" in Chinese (Simplified)
Definition
这个表达表示，如果一个人不知道某件事，那件事情就不会让他难过或受伤。常用于为不告诉某人不愉快的消息找借口。
Usage Notes (Chinese (Simplified))
通常是非正式的俗语。在隐瞒信息或不想让人担心时常被引用。比如父母不告诉孩子坏消息。有时用来为不透明性辩护，表达“无知是福”。
Examples
Some people say what one doesn't know won't hurt one when they hide secrets.
有人藏秘密时会说“**眼不见心不烦**”。
He didn't tell his friend about the mistake because he thought what one doesn't know won't hurt one.
他没告诉朋友错误，觉得“**不知道就不会受伤**”。
Parents sometimes believe what one doesn't know won't hurt one and don't share bad news with children.
父母有时认为“**眼不见心不烦**”，不会告诉孩子坏消息。
Honestly, what one doesn't know won't hurt one, so just keep it to yourself.
说真的，**眼不见心不烦**，你自己知道就好。
Should I tell her the truth? Maybe what one doesn't know won't hurt one in this case.
我该告诉她实情吗？也许这次“**不知道就不会受伤**”。
I always say what one doesn't know won't hurt one when it comes to surprise parties.
说到惊喜派对，我总说“**眼不见心不烦**”。