11.   The Westfield guardsmen took off at a time of heightened threat to the U.N. peacekeepers.

12.   Tokyo and Seoul also pledged closer military cooperation in response to the heightened threat from the reclusive North.

13.   Britain meanwhile sought to mend battered relations with Israel following the public row over the police response to warnings of a heightened terrorist threat prior to the London bombings.

a. + threat >>共 500
serious 5.58%
terrorist 4.61%
potential 3.55%
new 3.00%
biggest 2.94%
military 2.74%
immediate 2.39%
real 2.28%
greatest 2.24%
major 1.93%
heightened 0.13%
heightened + n. >>共 278
security 16.59%
tension 13.28%
alert 7.65%
concern 5.57%
state 3.49%
awareness 2.75%
sense 2.69%
interest 2.33%
competition 1.96%
risk 1.96%
threat 0.80%
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