I suggest you contact the competent authorities for further information regarding issues about Sino-U. S. economic and trade relations.

关于中美经贸关系等问题，建议你向中方主管部门了解有关立场。

youdao

Even though the value of the Manta air base lies more in the realm of trade (as a cargo transit point) than in the military, the air base's current U.S. military role means the potential impact on Sino-U.S. military relations cannot be ignored.

CENTERFORSECURITYPOLICY: China displaces the U.S. at Ecuador's Manta Base

With Sino-U.S. relations deteriorating, some think it is wise to cultivate China's populous and well-armed neighbor.

CNN: ASIANOW - Asiaweek

This is especially true now that Sino-U.S. relations are on the mend.

CNN: TEST OF WILLS