v. + problem >>共 361
have 22.63%
solve 9.06%
cause 5.52%
face 3.36%
address 2.77%
create 2.61%
pose 2.36%
fix 2.32%
resolve 2.12%
discuss 1.64%
encounter 0.87%
encounter + n. >>共 748
problem 12.99%
resistance 8.98%
difficulty 5.71%
opposition 4.38%
trouble 2.40%
obstacle 1.38%
people 1.06%
turbulence 1.01%
man 0.92%
criticism 0.83%
每页显示:    共 280