2 sentences

1. 上海是世界上最繁忙的航运中心之一。

   Shàng​hǎi shì shì​jiè shàng zuì fán​máng de háng​yùn zhōng​xīn zhī​yī.

   Shanghai is one of the world's busiest shipping centers.

   Source: Dong Chinese Dictionary

2. 琼粤之间的航运非常发达，极大地方便了两省之间的往来。

   Qióng Yuè zhī​jiān de háng​yùn fēi​cháng fā​dá, jí​dà de fāng​biàn le liǎng shěng zhī​jiān de wǎng​lái.

   Shipping between Hainan and Guangdong is highly developed, greatly facilitating travel and exchanges between the two provinces.

   Source: Dong Chinese Dictionary