a. + airline >>共 754
major 8.79%
national 4.93%
commercial 3.79%
the 3.48%
foreign 3.33%
european 2.93%
domestic 2.81%
international 2.68%
new 2.68%
regional 2.44%
regional + n. >>共 949
leader 3.14%
government 2.67%
currency 2.62%
bank 2.15%
security 2.12%
market 1.47%
office 1.43%
company 1.38%
cooperation 1.28%
crisis 1.25%
airline 0.74%
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