By the way 是一个简单而非常实用的英文句子，例如你跟别人聊天，谈到一些尴尬话题，此时你可说：By the way，接着说别的事情避开尴尬场面。By the way通常用在谈话时转到别的话题的一个连接词，可以解作‘除此之外’和‘顺便一提’的意思，有时候会简写成btw。 另外，在书信上我们常看见P.S.的英文字母在信的末端出现，它的全写是Post script，Post是拉丁文 After(在之后)的意思，在正文之后的东西就是附注。

对话

A：Check, please.

B：That's 34 dollars. Thank you.

A：You're welcome. By the way, may I have your number, Candy?

B：Sorry, I'm afraid not.

A：Oh, I'm sorry, don't get me wrong. I just want the restaurant's number to make a reservation.

B：I understand but we're closing down next Monday.

甲：请结账。

乙：34元，谢谢。

甲：不用客气。除此之外，肯蒂，可否给我你的电话号码?

乙：对不起，不行。

甲：噢，对不起，不要误会。我只是想要餐厅的电话号码以便订位。

乙：我明白，但我们于下周一结束营业。

By the way三字，一般译做‘顺便说说’，表示要转入新话题或提出忽然想到的事。譬如说，你和朋友在谈西方音乐，忽然想到中乐，你就可以问：By the way, do you like Chinese music as well?(说到音乐，你也喜欢中乐么?)。

By the way的另一说法，是incidentally。形容词(adjective) incidental即‘附带的’，例如：There are quite a few problems incidental to relocating to a foreign country(迁居国外，附带的问题不少)。Incidentally等于‘附带谈谈’，例如：I didn't know he was one of your best friends.... Incidentally, do you know his sister?(我一向不知道他是你的好朋友....那你认识他的妹妹吗?)Incidentally除了用于口头，也常见于文字;by the way则少见于文字，多用于口头。

By the way也作by the by或by the bye，例如：By the by, he'll be here tomorrow(顺便一提，他明天会来这里)。By the by切勿和by and by混淆：by and by是‘不久’的意思，例如：He said he would be here by and by.(他说不久就会来到)。

By the way也不可和by way of混淆：by way of是‘当作’或‘经由’的意思，例如：(1) Tom gave him some money by way of thanks for helping with the luggage.(汤姆给他一些钱，算是答谢他帮忙提行李)。 (2) He went to Shanghai by way of Hong Kong.(他经由香港到上海)。