21.   Flooding in East Africa has been blamed on El Nino, which occurs every few years when a major warming pattern develops in the tropical waters of the Pacific.

n. + develop >>共 1756
company 6.79%
shower 3.16%
thunderstorm 3.03%
scientist 2.19%
child 1.45%
problem 1.44%
patient 1.42%
researcher 1.28%
people 1.12%
country 0.92%
pattern 0.27%
pattern + v. >>共 286
be 32.15%
emerge 6.68%
continue 4.37%
change 3.90%
hold 2.36%
repeat 1.71%
seem 1.65%
persist 1.42%
have 1.30%
develop 1.24%
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