31.   The device consisted of a cylinder of liquefied gas and an ignition system.

n. + system >>共 804
computer 5.46%
school 2.85%
defense 2.63%
missile 2.33%
justice 2.00%
pressure 1.82%
tax 1.74%
security 1.68%
cable 1.60%
control 1.49%
ignition 0.09%
ignition + n. >>共 34
source 20.69%
key 16.75%
system 15.27%
switch 12.81%
device 5.91%
problem 5.42%
module 3.94%
timing 3.45%
button 1.48%
case 0.99%
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