21.   When electric current flowed through the iron and chromium layers, the spins of the electrons continually bounced back and forth.

n. + flow >>共 585
money 9.05%
water 7.56%
blood 3.99%
tear 3.67%
river 3.06%
oil 2.51%
traffic 2.41%
capital 1.90%
air 1.86%
power 1.62%
current 0.97%
current + v. >>共 194
be 14.47%
carry 5.04%
flow 4.61%
sweep 4.17%
associate 3.73%
push 3.29%
run 2.41%
make 1.97%
promote 1.75%
take 1.32%
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