China borders North Korea on the Yalu River.

国与鲜以鸭绿江为界。

Then they moved toward the Yalu River, the border between North Korea and China.

然后向界鸭绿江进发。

The soldiers at the border would pull the merchandise across the Yalu river with ropes, he says, and he would pay them off.

他说，防军会用绳索货物从绿鸭江对岸拖过来，然后他再“孝敬”他们。

About 74 years ago, the CPV crossed the Yalu River and fought alongside the army and civilians of the Democratic People's Republic of Korea.

74，国人民志愿军跨越鸭绿江，同鲜军民并肩作战。

This presented MacArthur with the frustration of having planes from Chinese bases assault United Nations depots, supply lines, and troops and then retreat to their sanctuary north of the Yalu.

这让麦克阿瑟感到沮丧，因为国基地的飞机袭击了联合国的仓库、补给线和部队，然后撤退到鸭绿江以北的避难所。