1. He was also a writer of beautiful stories, some of which are collaborations with his fiancée. 他也撰写优美的故事，有些是和他的未婚妻合作的成果。
2. There are historical and political reasons as to why collaborations emerge. 这项合作的产生有其历史和政治上的原因。
3. He says collaborations have also emerged because of increased possibilities. 他说，合作的出现也是因为可能性的增加。
4. There has never been a better time for collaborations with foreign scientists. 从来都没有像现在这么好的与外国科学家合作的时机。
5. Caroline Wagner, a research scientist at George Washington University, notes that international collaborations offer additional flexibility. 乔治华盛顿大学的研究科学家卡罗琳·瓦格纳指出，国际合作提供了额外的灵活性。
