a. + material >>共 922
nuclear 4.99%
radioactive 4.13%
building 4.10%
new 3.77%
hazardous 3.53%
genetic 2.61%
bomb-making 1.24%
explosive 1.07%
reading 1.07%
educational 1.05%
promotional 1.05%
promotional + n. >>共 358
material 7.88%
campaign 7.44%
tour 3.69%
event 3.43%
video 2.73%
activity 2.67%
effort 2.48%
spot 1.91%
gimmick 1.84%
appearance 1.78%
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