In addition to the underground coalition against the Soviet Union, the two leaders also signed a series of agreements on scientific and technical cooperation and cultural exchange. The content includes: co-placement, together with overseas students, cooperation in the fields of energy exploitation, high-energy physics and space engineering. Harper lee to kill a mockingbird poster. These agreements represent an irreversible new trend in Sino-American relations, the song said. But Dang said, those things “are just the beginning, but not the end, later there are many ways and fields of cooperation between the two sides waiting for us to exploit.