31.   The crust of lichens and mosses that hold moisture in the soil is broken.

v. + moisture >>共 165
draw 7.29%
absorb 6.93%
retain 5.99%
hold 3.64%
keep 3.64%
gather 3.29%
remove 3.06%
add 2.82%
trap 2.82%
need 2.82%
hold + n. >>共 711
talk 13.23%
meeting 4.85%
election 4.61%
hearing 3.09%
hand 1.51%
position 1.44%
rally 1.24%
discussion 1.20%
office 1.17%
service 1.16%
moisture 0.06%
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