researcher link/nsv

21.   Researchers have again linked the diet drugs Redux and fen-phen to heart-valve problems but also reported today that the problems are rarely serious.

n. + link >>共 620 个
report 5.17%
study 4.60%
police 4.40%
evidence 3.48%
official 2.61%
authority 2.20%
investigator 1.84%
road 1.53%
government 1.53%
system 1.13%
researcher 1.07%
researcher + v. >>共 450 个
say 19.69%
find 8.84%
be 4.75%
believe 2.70%
use 2.12%
have 2.00%
report 1.80%
hope 1.76%
look 1.60%
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link 0.19%
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