clear-air turbulence
The erratic movement of air masses in the absence of any visual cues, especially such movement that causes unexpected turbulence to an aircraft.
(zoology) nursers; those birds whose young are hatched in a very immature and helpless condition, so as to require the care of their parents for some time.
(transitive, rare) To provide with a new lawn.
After an emergency.
機長は、次の1時間で晴天乱気流に遭遇する可能性があると乗客に警告した。
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