routine check/amn
a. + check >>共 576 个
routine 5.90%
medical 5.07%
bad 4.16%
random 2.69%
monthly 2.38%
canceled 2.20%
personal 2.12%
regular 2.08%
first 1.93%
quick 1.82%
routine + n. >>共 938 个
check 3.95%
maintenance 3.77%
inspection 3.11%
patrol 2.96%
mission 2.23%
flight 2.08%
test 2.05%
checkup 1.87%
procedure 1.49%
grounder 1.44%
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