11.   The four surveillance cameras have powerful zoom lenses and spotlights which can illuminate trouble areas.

n. + area >>共 873
border 6.89%
self-rule 3.20%
ski 2.93%
wilderness 1.66%
storage 1.64%
problem 1.57%
service 1.37%
tourist 1.33%
growth 1.33%
resort 1.17%
trouble 0.09%
trouble + n. >>共 241
breathing 16.15%
understanding 3.85%
finding 2.94%
maker 2.75%
reading 2.39%
area 2.02%
sign 1.83%
hearing 1.47%
run 1.47%
support 1.28%
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