1 sentence

1. 他为了工作，常年穿梭于北京和上海这两座直辖市之间。

   tā wèi​le gōng​zuò, cháng​nián chuān​suō yú Běi​jīng hé Shàng​hǎi zhè liǎng zuò zhí​xiá​shì zhī​jiān.

   For work, he shuttles between the two municipalities of Beijing and Shanghai all year round.

   Source: Dong Chinese Dictionary