2 sentences

1. 中国拥有漫长的海岸线。

   Zhōng​guó yōng​yǒu màn​cháng de hǎi'àn​xiàn.

   China has a long coastline.

   Source: Dong Chinese Dictionary

2. 这种自然力长期作用于海岸线。

   zhè zhǒng zì​rán​lì cháng​qī zuò​yòng yú hǎi'àn​xiàn.

   This natural force has long acted upon the coastline.

   Source: Dong Chinese Dictionary