Theme song
主题歌, 信号曲, 套话
📖 牛津释义
theme song
(also `theme tune),
(a) melody that is often repeated in a musical play, film, etc （音乐剧、电影等中的）主题曲, 主题歌.
(b) = signature tune (signature).
🧩 词语组成解析
theme
[θim]
n. [乐]主题;主旋律;题目，话题;（学生的）作文;
adj. 以奇想主题布置的;
song
[sɔŋ]
n. 歌曲;歌唱（艺术）;诗歌，韵文;鸟叫声，鸟语;
🗣️ 情景例句
He is an orphan, so he is not sure which family name he should have.
他是个孤儿，因而不知道他自己姓什么。
To enter outer space
飞出大气层，进入外太空
I'm sowing cabbages.
我在播白菜种。