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