I guess ground is the passive voice of grind here. BTW, in general, people who have taken TOFEL and GRE test do have better English than those who haven’t. At least they have put more efforts into it.
-birdincage(birdincage);
2001-9-23(#208548@0)
Totally agree with you. However, I get this only after I checked my CIBA2000.
-pyramid(金字塔);
2001-9-23(#208581@0)