21.   The United States is also calling for making terrorist bombings an international crime and requiring explosives manufacturers to use chemical markers to facilitate tracing.

v. + marker >>共 112
place 7.72%
use 7.37%
have 4.21%
erect 3.86%
move 3.51%
put 3.16%
destroy 2.46%
leave 2.46%
find 2.11%
lose 2.11%
use + n. >>共 1468
money 3.08%
force 2.34%
technology 1.42%
drug 1.21%
name 1.17%
computer 1.08%
fund 1.06%
proceeds 0.84%
information 0.74%
method 0.72%
marker 0.02%
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