surveillance operation/nmn

51.   The plan was foiled by a police surveillance operation, he said.

n. + operation >>共 731 个
rescue 8.60%
relief 2.61%
police 2.56%
security 2.40%
search 2.39%
heart 2.27%
business 1.94%
sting 1.74%
bypass 1.68%
basketball 1.67%
surveillance 0.44%
surveillance + n. >>共 180 个
camera 18.12%
plane 11.63%
system 8.75%
flight 7.70%
equipment 5.76%
aircraft 4.09%
mission 3.09%
tape 2.72%
operation 2.67%
videotape 1.73%
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