Wonders of the world

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Across
  1. 4. none form for discuss
  2. 8. 响亮的
  3. 9. answer to
  4. 11. 电
  5. 14. 照耀
  6. 15. 靠近
  7. 16. almost
  8. 17. 峡谷
  9. 19. no sound
  10. 21. 天空
Down
  1. 1. next to
  2. 2. 大自然的
  3. 3. 奇观
  4. 5. 银灰色的
  5. 6. also written as gray
  6. 7. 开始消失
  7. 10. 迹象
  8. 12. can't coexsist(共存）with but
  9. 13. still be there
  10. 14. spring
  11. 15. opposite to above
  12. 18. self-thinking
  13. 20. opposite to western