11.   The same Pentagon officials, the magazine says, are divided over how to bolster US aircraft-based defenses to increase the ratio of ballistic missile kills.

v. + ratio >>共 133
calculate 5.21%
adjust 3.82%
increase 3.82%
have 3.47%
measure 3.47%
improve 3.13%
change 2.78%
use 2.43%
compute 2.08%
know 1.74%
increase + n. >>共 661
number 5.30%
risk 3.45%
pressure 3.43%
cost 2.23%
production 2.20%
chance 2.07%
security 1.77%
demand 1.67%
sale 1.66%
price 1.64%
ratio 0.05%
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