It's grown into the best selling line of commercial jets in history.

它已经发展成为历史上最畅销的商用飞机系列。

Since the first twin jet Baby Boeing was introduced in 1967, it's grown into the best selling line of commercial jets in history.

自1967年发布首款双引擎喷气式飞机Baby波音以来，737系列已经成为商用喷气式飞机史上最畅销的型号。