Letterheading
(letterhead 的现在分词) n. 信笺上方的印刷文字, 印有抬头的信笺
🗣️ 情景例句
Good night, Robbie.
晚安，Robbie。
I'm working on it.
我正在努力。
it was not long before its use as the uniquely recognizable broadcasting frequency for interstellar communication was suggested.
提出把它作为星际间唯一可辨认的广播频率就为期不远了。