robust engagement The U.S.has a long and fruitful history of engagement with China on energy related cooperation since January,1979,and under the current administration,the U.S.has a robust engagement with China through bilateral and multilateral mechanisms
问题描述：
robust engagement
The U.S.has a long and fruitful history of engagement with China on energy related cooperation since January,1979,and under the current administration,the U.S.has a robust engagement with China through bilateral and multilateral mechanisms
答
根据全文的意思应该是“紧密（强劲）的合作（接触）”.