21.   The Airbus jet is still flying with a different engine installed.

a. + engine >>共 686
new 8.27%
powerful 4.59%
economic 3.58%
main 2.89%
left 2.11%
right 2.11%
same 1.93%
blown 1.42%
small 1.42%
single 1.24%
different 0.96%
different + n. >>共 1053
way 3.56%
kind 2.51%
story 2.01%
type 1.82%
approach 1.73%
view 1.62%
part 1.49%
thing 1.37%
time 1.23%
direction 1.12%
engine 0.04%
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