波音引擎問題、各地的疫情現況、太空經濟｜2021年2月23日。 (The Costs Of Space Travel | February 23, 2021) - VoiceTube 看影片學英語

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• There was a separate incident

• aerospace companies

• radioed a distress signal

• debris

• populated areas

• fan blade

• 航空管理局

• Aviation Administration

• ground

• 停飛

• 另一起事件

• was cited as a factor

• drop in all but a few states.

• 除少數幾個州外

• historically decreased

• immunities

• variants

• mutated versions of coronavirus

• mutate

• variants.