第几周怎么说?答:1. first, 1st 2. second, 2nd 3. third, 3rd 4. fourth, 4th 5. fifth, 5th 6. sixth, 6th 7. seventh, 7th 8. eighth, 8th 9. ninth, 9th 10. tenth, 10th 11. eleventh, 11th 12. twelfth, 12th 13. thirteenth, 13h 14. fourteenth, 14th 15. fifteenth, 15th 16. ...