Final answer:
The sentences provided focus on training astronauts in zero gravity and underwater conditions, emphasizing the necessity of specific training.
Explanation:
1. Astronauts should be trained in zero gravity.
2. They have to be given the chance to work in those conditions.
3. Equipment must be tested in conditions similar to space.
Zero gravity can be experienced underwater as well as on the ISS.
Underwater living space will be provided by Aquatics Laboratory. Astronauts may be sent there for training.
7. Skills for Moon missions could also be developed underwater.
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