11.   In recent years, he suffered from recurring pulmonary problems.

12.   In recent years, Burger suffered from recurring pulmonary problems.

13.   In recent years he had suffered from chronic pulmonary problems.

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%
pulmonary 0.03%
pulmonary + n. >>共 76
hypertension 15.45%
disease 12.04%
embolism 10.73%
fibrosis 8.38%
anthrax 5.50%
edema 4.97%
tuberculosis 4.19%
problem 3.40%
specialist 2.09%
medicine 2.09%
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