Viết lại câu : 1. A spacecraft is a vehicle. It is used for travel into space <which> 2. The International Space Station is a large spacecraft. It was launched in 2011 <which> 3. An astronomer is a scientist. An astronomer studies the sun, the moon and other planets <who> 4. The place has a microgravity environment. Astronauts live and conduct research there <where>
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