turbulence

noun

unstable flow of a liquid or gas
液体あるいは気体の不安定な流れ
a state of violent disturbance and disorder (as in politics or social conditions generally)
激しい騒乱や騒動の状態（政治的または社会的情勢などの場合が一般的）
- the industrial revolution was a period of great turbulence
  産業革命は大混乱の時期であった
instability in the atmosphere
不安定な大気

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