11.   U.S. scientists hope to begin clinical trials transplanting hearts from pigs into humans within two years, an announcement that promises to renew a fierce ethics debate.

v. + heart >>共 495
take 9.49%
have 8.92%
break 7.30%
win 4.70%
warm 2.45%
touch 2.33%
eat 2.13%
lose 2.01%
open 1.62%
follow 1.44%
transplant 0.33%
transplant + n. >>共 105
organ 16.06%
seedling 6.02%
cell 4.42%
heart 4.42%
tree 4.02%
kidney 3.61%
tissue 3.61%
patient 2.81%
surgery 2.41%
tendon 2.01%
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