51.   The presence of explosives for the drug-sniffing dogs would appear to bolster renewed speculation that a mechanical failure caused the crash.

n. + cause >>共 1473
rain 1.85%
attack 1.21%
problem 1.17%
disease 1.11%
explosion 1.03%
bomb 0.96%
drug 0.95%
storm 0.92%
blast 0.92%
virus 0.88%
failure 0.37%
failure + v. >>共 335
be 37.24%
cause 3.37%
occur 3.17%
mean 2.38%
come 2.31%
make 2.05%
have 1.98%
lead 1.98%
leave 1.26%
become 0.93%
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