What does “jointly” mean?, together, alone, quickly, secretly, What does “observe” mean?, to ignore, to watch, to hide, to destroy, What does “backdrop” mean here?, a scientific theory, a physical barrier, the general situation, a successful launch, What does “ambitious” mean?, simple and easy, safe and cheap, common and local, difficult and grand, What does “evolve” mean?, to develop gradually, to stop completely, to break apart, to stay the same

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