21.   They said the high prices are the result of tight supplies, transmission problems and the design of the California electricity markets.

22.   Transmission problems also cost two-time winner Luyendyk.

n. + problem >>共 955
health 11.61%
heart 4.65%
drug 2.79%
security 2.11%
computer 1.60%
safety 1.51%
knee 1.51%
image 1.25%
injury 1.12%
kidney 0.97%
transmission 0.12%
transmission + n. >>共 190
line 24.78%
system 7.64%
tower 6.39%
equipment 4.09%
network 3.02%
service 2.93%
facility 2.84%
rate 2.31%
capacity 2.22%
problem 1.95%
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