B3 U4 Reading and Thinking

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Across
  1. 2. the plural(复数) of datum
  2. 3. a border between two countries
  3. 6. an administrative(行政的) unit of government
  4. 10. (v.)to send a space vehicle, satellite, or other object into the air or into space
  5. 11. a person trained to travel in a space
  6. 13. free from external control and constraint
  7. 15. expect and wish
Down
  1. 1. (v.) to move around a large object in space such as a planet
  2. 2. the force that makes any two objects that have mass move toward each other. The most common example of this is when an object falls to the ground
  3. 3. a machine that you travel in or on, especially one with an engine that travels on roads, for example a car, bus.
  4. 4. human
  5. 5. a vehicle shaped like a tube(管子)that travels in space
  6. 7. (n.)any communication that encodes(加密) a message
  7. 8. an object that is sent into space to travel around the Earth in order to receive and send information
  8. 9. the whole of space and all the stars,planets,and other forms of matter and energy in it
  9. 12. to control what something will be
  10. 14. (adj.)you are sad because something has not happened or because something is not as good as you had hoped