russo
международные отношения português
política internacional espanhol
política internacional catalão
relacions internacionals 
Studies about relationships between two or more states.
1
However, a number of global studies suggest the average age of puberty is falling.
2
In total, 552 different lysine methylation sites were determined, making this one of the most comprehensive global studies published to date.
3
The contamination of water due to heavy metals (HMs) is a big concern for humankind; however, global studies related to this topic are scarce.