There are abundant oil and gas resources in China East Sea, so this area has great amplitude development future.

东海蕴藏着丰富的油气资源，具有广阔的开发前景。

youdao

Located in China, the Yangtze River is 3,917 miles long and flows into the East China Sea.

长江位于中国，全长3917英里，流入中国东海。

youdao

The Changjiang River empties into the East China Sea.

长江注入东海。

《新英汉大辞典》

In terms of the Western Pacific, we are present in the South China Sea and East China Sea and elsewhere on a very routine basis.

WHITEHOUSE: Press Briefing with Ben Rhodes and Admiral Robert Willard

The deal was a coup for China, which had shifted its military focus away from a potential Soviet land invasion, and now wanted to defend territorial claims over Taiwan and parts of the South China Sea and East China Sea.

WSJ: China Clones, Sells Russian Fighter Jets

Influenced by the writings of Fernand Braudel and Immanuel Wallerstein (historians who helped establish a tradition of global comparative history), large numbers of Japanese intellectuals are beginning to realise that a global economic system existed in the areas around the Indian Ocean, the Arabic Sea, the South China Sea, and the East China Sea long before the westernisation of the world.

ECONOMIST: The once and future boom