btw
顺便说一句，顺带提一下（by the way的缩写）
written abbreviation for by the way: used, for example in emails, when you are writing something that relates to the subject you are discussing, but is not the main point of the discussion
I hope you enjoyed your holiday in Florida - btw, can you recommend a good hotel? 但愿你在佛罗里达过得很愉快。顺便说一句，你能推荐一个好的宾馆吗？