21.   Researchers stressed that it is impossible to calculate the risk with precision because so many factors are involved.

22.   This risk is calculated for people who do not use condoms and who have sex regularly with one infected partner.

23.   The companies would need years of statistical analysis to calculate the risk, huge capital reserves to cover potential mishaps and a high level of expertise, analysts argued.

v. + risk >>共 497
take 13.91%
reduce 12.96%
increase 8.50%
run 5.86%
pose 4.71%
carry 3.83%
raise 2.50%
minimize 2.25%
face 2.20%
lower 1.85%
calculate 0.25%
calculate + n. >>共 390
cost 4.87%
index 3.80%
figure 3.72%
rate 3.08%
amount 2.51%
value 2.44%
payment 2.36%
loss 1.86%
tax 1.79%
number 1.72%
risk 1.65%
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