a. + problem >>共 705
serious 4.46%
economic 3.74%
major 3.48%
financial 2.66%
biggest 2.34%
technical 1.95%
only 1.92%
big 1.91%
potential 1.91%
real 1.87%
pressing 0.34%
pressing + n. >>共 181
issue 18.02%
need 13.90%
problem 12.37%
concern 8.53%
question 6.23%
matter 4.12%
charge 2.40%
business 1.73%
reason 1.34%
button 1.34%
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