apropos

形容词 apropos:

1. of an appropriate or pertinent nature

副词 apropos:

1. by the way
   同义词：incidentally
2. at an opportune time
   同义词：seasonably, timely, well-timed

1. Apropos, I have something to tell you.
   顺便，我有点事跟你说。
2. Apropos our date for lunch, I can't go.
   关于我们的午餐约会，我不能去
3. Apropos of what you were just saying ...
   关於你刚才所说的话 ...

ap.ro.pos

adj.（形容词）
Being at once opportune and to the point.See Synonyms at relevant
恰当的：适宜而切题的参见 relevant
adv.（副词）
At an appropriate time; opportunely.
适宜地：在合适时间地；适宜地
By the way; incidentally:
顺便说；随带问一句：
例句：
Apropos, where were you yesterdayô
顺便问一句，你昨天在哪儿ô

prep.（介词）
With regard to; concerning:
关于；有关：
例句：
Apropos our date for lunch, I can`t go.
关于我们的午餐约会，我不能去

来源：
French à propos
法语 à propos
à [to] from Latin ad- * see ad-
à [到] 源自 拉丁语 ad- *参见 ad-
propos [purpose] from Latin prôpositum from prôponere prôposit- [to intend] * see propose
propos [目的] 源自 拉丁语 prôpositum 源自 prôponere prôposit- [倾向于] *参见 propose