v. + accident >>共 205
cause 21.58%
investigate 12.77%
prevent 7.33%
have 6.64%
follow 5.03%
report 4.93%
blame 4.89%
survive 3.87%
avoid 3.37%
reduce 2.90%
prevent + n. >>共 1204
attack 3.54%
violence 1.93%
spread 1.72%
people 1.65%
company 0.97%
infection 0.92%
recurrence 0.88%
problem 0.87%
cancer 0.87%
disease 0.85%
accident 0.73%
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