四级词谜

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Across
  1. 4. a good quality; deserve praise
  2. 6. usual; a standard state
  3. 8. one of a kind; unlike others
  4. 10. a legal right for an invention; obvious
  5. 12. happen or take place
  6. 14. improve; a change for the better
  7. 15. the central part of a nut or seed
  8. 16. a state of peaceful coexistence
Down
  1. 1. stop doing something
  2. 2. mental or emotional strain
  3. 3. physical or mental work; work hard
  4. 5. walk aimlessly; stray
  5. 7. take a risk; a risky project
  6. 9. a long trip; travel to a place
  7. 11. not deep; lacking depth of thought
  8. 13. pay no attention to something