clear-air turbulence
英
美
- air n.空气;天空;空中;感觉;神态;曲调;装腔作势v.晾干;使通风;广播
- clear adj.清楚的;明确的;明白(某事)的;清晰的;清澈的;晴朗的;头脑清醒的v.清空;清除;澄清;放晴;使明确adv.清楚地;彻底地n.空地
- turbulence n.骚乱;动荡;喧嚣;狂暴;湍流
Noun:
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strong turbulence in an otherwise cloudless region that subjects aircraft to violent updrafts or downdrafts