在英语中再见可以用So long，so的意思是：这么如此，long的意思是：长时间，长的，so long直译为那么长时间如此长时间很长这么久。例如：I haven't see you so long time.我很久没有见过你了。
I was a fool you endure him for so long.我容忍他这么久真是傻。
因为so long是“再见”的非正式表达。
Sorry I took so long.
对不起，我用了这么长时间。
I haven't had a decent evening for so long !长久以来，我没有一晚过得舒服！
He did n't expect to live so long .他没想到会活得那么长命。
So long as one keeps calm ， one does n't feel the heat too much .心静自然凉。
There was once a time ， and not so longago either .有一次，而且还是不久以前。
Stay so long as you like .只要你喜欢尽管待在这儿好啦。
