difficulty be/nsv
n. + be >>共 1635 个
problem 0.82%
people 0.79%
company 0.71%
result 0.67%
thing 0.63%
report 0.57%
question 0.56%
official 0.55%
time 0.53%
issue 0.48%
difficulty 0.03%
difficulty + v. >>共 200 个
be 43.38%
arise 6.62%
lie 3.40%
remain 2.57%
come 2.39%
have 1.65%
make 1.38%
begin 1.19%
force 1.19%
prevent 1.10%
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