"笑着活下去" 的英文翻译是 "Live with a smile on your face"。这句话源于一句著名的格言："Laughter is the best medicine"（笑是最好的药）。它的意思是说，笑容能够提升人的情绪，帮助人们更好地度过困难时刻。

下面是一些可以使用这句话的例句：

I know life is tough, but remember to live with a smile on your face.

No matter what obstacles you face, always try to keep a positive attitude and live with a smile on your face.

Life is too short to be anything but happy, so make sure to live with a smile on your face.

翻译：

我知道生活很艰难，但请记住笑着活下去。

无论你面临什么困难，都要保持积极的心态，笑着活下去。

生命苦短，要快乐地过，所以要笑着活下去。