The two organizations 'paired up' to educate the public about the threat of global warming.
I can't do everything at once—I've only got 'one pair of hands'. [=I am only one person]
To avoid competition, breeding/mating 'pairs' stay away from other male chimpanzees.
(..) - Let's hear it. Let's hear it. It's using the air shafts. - We don't know that. - That's the only way. We'll move in pairs. We'll go step by step... and cut off every bulkhead and every vent... until we have it cornered, and then we'll blow it the fuck out into space. (..)1979 Alien