21.   At least five firefighters were injured by a collapsing wall late Monday while they were burrowing a tunnel through the rubble to reach survivors.

a. + wall >>共 1204
stone 6.20%
concrete 4.37%
high 2.99%
white 2.60%
back 2.53%
outside 2.46%
outer 2.07%
interior 1.93%
exterior 1.78%
thick 1.13%
collapsing 0.36%
collapsing + n. >>共 108
wall 8.43%
economy 6.43%
building 6.02%
tower 4.82%
structure 3.61%
peace 3.61%
home 3.21%
currency 3.21%
price 2.81%
roof 2.81%
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