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As long as you're happy.无感情色彩
As long as you're happy，I could do everything for you.
只要你开心，我什么都愿意。

Good for you. 不屑的感觉
=Go fuck yourself
Trump: I just got the promotion that you were hoping for!
川普：我刚升职啦，就是你一直想要的那个职位。
Hilary: Good for you!
希拉里：你开心就好...

Good luck. 略带讽刺的意味
光头强：I think I'll be the next Jack Ma in China！
感觉我要成为中国下一个马爸爸！
papi酱：Good luck with that.
你开心就好...

Suit yourself. 中立、幽默or生气
John (reading the menu): The steak sounds good, but it's hard to pass up the fried chicken.
（看菜单）牛排好像不错，不过炸鸡也不得不点呀。
Sally: Suit yourself. I'll have the steak.
你随便，我点牛排了。