Across
- 2. the opposite of invalid
- 3. to be opposed to sth
- 6. state in detail
- 7. an event that causes serious harm
- 9. goods for buying and selling
- 12. sth that gives proof of sth else
- 15. necessary
- 17. extremely important
- 18. very nearly, but not quite
- 20. garbage disposal
Down
- 1. drink
- 4. related to chemistry
- 5. the level of thickness or smoothness
- 8. 砷
- 10. the opposite of compose
- 11. an approximate calculation
- 13. and mineral essential parts of human body
- 14. immediately
- 16. 铅
- 19. escape accidentally