What's the meaning of "Look before you leap(跳)"?

look before you leap. "Look before you leap! what ever you do,please look before you leap. Look before you leap中文 Look twice before you leap 是What's the meaning of you?还是What's the meaning of yours? what 's the meaning of. What's the meaning of '@'? what's the meaning of Look before you leap的意思 look before you leap是三思而后行吗 What's the meaning of I love you