21.   They quickly died off, and their re-appearance here will perhaps be their last trace.

22.   It also committed the church to eradicating the last traces of racism.

a. + trace >>共 154
chemical 7.02%
last 6.43%
minute 4.97%
small 3.80%
visible 3.80%
only 3.51%
faint 3.22%
slightest 3.22%
tiny 1.75%
measurable 1.46%
last + n. >>共 522
season 13.70%
year 7.78%
summer 7.20%
fall 5.24%
time 4.81%
weekend 4.53%
week 4.10%
day 3.19%
spring 3.07%
month 2.95%
trace 0.03%
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