v. + difficulty >>共 299
have 50.02%
face 9.00%
experience 2.78%
encounter 2.41%
cause 2.01%
overcome 1.99%
acknowledge 1.54%
underscore 1.23%
cite 1.21%
pose 1.05%
experience + n. >>共 1136
problem 7.00%
pain 4.31%
difficulty 3.26%
growth 2.51%
loss 1.57%
symptom 1.48%
delay 1.44%
discomfort 1.25%
trouble 1.14%
feeling 1.05%
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