Invention

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Across
  1. 1. it is convenient for people to konw the time
  2. 4. it from the war between Greece and Poland（we used to learn about it on an English reading question）
  3. 7. methods of virus prevention
Down
  1. 2. invented in 1879 and we use it everynight
  2. 3. we use it to communicate with each other
  3. 5. a silvery white metal
  4. 6. it can bring use cool and use electrity to operate
  5. 8. a ancient arms，it is also an important part of a famous Chinese story we have learned