这句话在什么语境中用“You\'re telling me”

这句话在什么语境中用“You\'re telling me”
这句话在什么语境中用“You\'re telling me”

这句话在什么语境中用“You\'re telling me”
"我早就知道啦!”的意思.
用在当别人和你说一件你很清楚的事情的时候,你就可以这么说拉!
E.G.：
Flevy:How often do you brush your teeth?
Jacky:After every meal.I want to keep them healthy.
Flevy:Me too.But do you floss?My dentist says that's very important,too!
Jacky:You're telling me!I have been flossing my whole life!

用于同意别人的意见时,相当于,you said it / i agree with you

"It's raining outside." "You're telling me-I've been out to get the paper and I'm absolutely soaked.":
"外面在下雨。""我早就知道了--刚才我出去取报纸淋了个透湿。"