21.   Composed of cells filled with air but perfectly sealed, cork is the only substance known to date which can recover its shape after being compressed.

n. + be >>共 1635
problem 0.82%
people 0.79%
company 0.71%
result 0.67%
thing 0.63%
report 0.57%
question 0.56%
official 0.55%
time 0.53%
issue 0.48%
cork 0%
cork + v. >>共 29
pop 27.38%
be 25.00%
have 7.14%
fly 4.76%
dry_out 3.57%
crumble 2.38%
look 2.38%
release 2.38%
allow 1.19%
begin 1.19%
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