One more credit today:上下两石你居中, Dow +24 almost =flat

上下两石你居中,
胖子变瘦瘦磨粉,
贸易工廠受磨炼,
饱味无多尝艰辛,
碾碎幾度发财梦,
尽绕圈子迷惑人,
心坚如铁再轧钢,
成才出自产业军.

GOOGLE
Upper and lower center stone you,
Fat change thin flour,
Trade mill by tempering,
Full flavor without more easy,
Crushed several times dreams of riches,
Every circle confuse people
Heart as hard as iron re-rolling,
Talent from the military industry.

P boy, Answer is
MILL