11. They are abrading tools, used to grind away excess material and to smooth the work surface. 12. Oftentimes they grind away anonymously for small purses. 13. Supercomputers grind away for weeks on these problems, 14. Slow-moving tornadoes can be particularly devastating, because they grind away , sometimes for minutes at a time. 15. Jospin has also managed to grind away at France's high unemployment rate, which was his stated priority. 16. But you grind away because you're trying to find out what . . . you're doing ." 17. "Now we don't have to grind away perfectly good teeth to make a crown, " he said. 18. But even as these legal mills grind away , the industry continues to change at a remarkable pace. 19. The beak was kept sharp by having the edges of the dental plates grind away at each other. 20. Although the chairmen of CBS Inc . and the Westinghouse Electric Corp . continued to " grind away "
