11.   The U.S. Food and Drug Administration has approved an eye laser that polishes the cornea to improve vision and prevent the need for many corneal transplants.

a. + transplant >>共 182
liver 45.19%
human 3.21%
successful 2.62%
first 1.90%
corneal 1.60%
intestinal 1.46%
second 1.46%
recent 1.31%
double 1.17%
life-saving 1.02%
corneal + n. >>共 26
abrasion 15.07%
transplant 15.07%
flap 10.96%
tissue 9.59%
ring 6.85%
scar 5.48%
ulcer 5.48%
cell 2.74%
disease 2.74%
surface 2.74%
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