a. + role >>共 848
key 5.90%
important 5.27%
major 4.40%
active 3.94%
new 3.38%
leading 3.03%
greater 2.04%
central 1.97%
prominent 1.58%
significant 1.57%
critical 0.87%
critical + n. >>共 1206
condition 26.79%
issue 2.54%
time 2.30%
role 1.76%
moment 1.72%
factor 1.19%
question 1.19%
report 1.13%
acclaim 1.01%
part 1.00%
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