If you decide to take a space (mình nghĩ chỗ này bị thiếu) trip, you will have to get ready a few months before the (2) flight (chuyến bay). You must be in excellent physical condition. You should run a lot, swim every day, and do aerobics and push-ups. You must get a letter from the doctor that shows you are in perfect (3) health. Once you get on the trip, you will be in a (4) different (tạm dịch: thế giới khác) world. You will see pictures of the Earth. You may also find your country and other interesting places. You will be able to see the oceans, the big rivers, and the tall mountains. You will be able to see them many times because you will (5) orbit (quỹ đạo) the Earth 16 times a day! You will also be able to see stars that you couldn't see (6) from (tạm dịch: bạn sẽ có thể thấy những ngôi sao mà bạn không nhìn được ở trái đất) the Earth. When you are in orbit, you will be able to get out of your seat and walk in the cabin. You will be able to walk on the walls or on the ceiling like in a circus. You will not (7) weigh (tạm dịch: bạn sẽ không có bất kỳ trọng lượng nào) anything! You will feel totally free and enjoy the wonderful feeling you have never had before. If you (8) were (tạm dịch: nếu như bạn đang ở trên chiếc tàu đó bây giờ, bạn sẽ cảm nhận được những điều kỳ diệu ấy) on board now, you would experience those marvelous things.