They are from different countries.
他们来自不同的国家。
On that day, you can see many friends, they are from different countries.
在那一天你可以看到许多的朋友，他们来自不同的国家。
Cooperation between scientists, whether they are from different countries or specializing in different areas, is a fact of life in the scientific world today.
来自不同的国家、在不同的领域从事研究的科学家们开展合作，在当今的科学界是一个不争的事实。
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