11.   Saw palmetto is used far more than prescription drugs in Europe to treat noncancerous prostate enlargement, but its chemical mechanism is unknown.

a. + enlargement >>共 72
further 8.23%
eastward 7.59%
prostate 6.96%
planned 5.70%
ambitious 3.80%
eastern 3.80%
proposed 3.80%
future 3.16%
entire 2.53%
next 2.53%
prostate + n. >>共 57
cancer 84.95%
surgery 4.41%
problem 1.45%
tumor 1.08%
antigen 0.70%
enlargement 0.59%
cell 0.59%
operation 0.54%
disease 0.43%
drug 0.32%
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