along came this promo for the local nightly news 有一部關於地方夜間新聞的廣告 請問along came這是甚麼用法 算是口語?

Along came this promo for the local nightly news.
接下來的是廣告片以及本地的晚間新聞報導。

"Along came" 只是簡單的動詞片語, 也可以説是"術語"。


另例: Along comes a law enforcement officer in his boat.
一個警官劃著船過來了。

這是一個倒裝句，主詞跟其修飾語（this promo for the local nightly news）放在動詞後面。而述部came的修飾語along（副詞）移到句前。英語在主詞太長的狀況下，通常會倒裝，或以虛主詞改寫，以免句子頭重腳輕。這不是口語，而是寫文章時才會用到的寫法。

He came along (with me).=他（跟我）一道來。
《新世紀英漢辭典》例句

promotion n. a video promotion of a product that is being promoted; one of their latest promotions
Inversion structure=OVS=came along
along adv., means forward on, along with,along came(note the word order)
alongside adv., means video, recordings,and other promotion to be used alongside
=together with or at the same time as TVB brought their advertisement promotion alongside their local nightly news program ?!

Along came也未算只在口語出現的，這是在講述一件事情的發展中途出現的另一樣事態或變化或表達"竟然出現"。

local我會譯作"本地"，尤其是假如你是按"當地"的習慣用詞或考慮是從"當地人"角度翻譯還是外文處境的文法翻"當地"。除非"local"是指地區性或詞語的意思是指"客觀"地方性才會翻譯成中文不確定詞的形容詞"地方"。

這句意：
途中(不知前文是甚麼處境，例如是電視廣播便直譯"廣播中")出現這本地(當地)晚間新聞的廣告。("promo"暫譯為"廣告"，但是"新聞"廣告有點怪。Promo其實應該譯作"推廣"/"推銷"/"宣傳")

請考慮前文後理來驗證用那種詞意。