v. + problem >>共 361
have 22.63%
solve 9.06%
cause 5.52%
face 3.36%
address 2.77%
create 2.61%
pose 2.36%
fix 2.32%
resolve 2.12%
discuss 1.64%
exacerbate 0.74%
exacerbate + n. >>共 218
problem 25.26%
situation 10.15%
tension 9.20%
crisis 1.90%
decline 1.80%
concern 1.69%
shortage 1.48%
conflict 1.48%
fear 1.27%
condition 1.06%
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