mechanism exist/nsv

11.   The United States and Canada have signed treaties allowing for the extradition of defendants, but no mechanisms exist to force a witness to cross the border.

n. + exist >>共 1655 个
problem 4.39%
evidence 2.06%
possibility 1.59%
opportunity 1.28%
difference 1.17%
life 1.15%
condition 1.10%
technology 1.04%
system 0.84%
group 0.78%
mechanism 0.18%
mechanism + v. >>共 171 个
be 39.56%
work 3.64%
allow 2.22%
involve 1.90%
have 1.74%
exist 1.74%
fail 1.74%
remain 1.42%
operate 1.27%
seem 1.27%
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