sudden shift/amn

61.   Wind shears are sudden shifts in wind speed and direction to a downward rush of cooler air.

a. + shift >>共 656 个
major 5.48%
significant 3.43%
fundamental 3.21%
dramatic 2.80%
first 1.95%
sudden 1.92%
demographic 1.64%
second 1.51%
such 1.51%
big 1.45%
sudden + n. >>共 1030 个
change 4.80%
surge 2.44%
departure 1.50%
burst 1.48%
drop 1.45%
loss 1.45%
rise 1.43%
shift 1.43%
increase 1.26%
appearance 1.22%
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