fluttering

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UK

B2 中高級
v.i.不及物動詞下注;打賭
Why do you keep fluttering your money away?
v.t.及物動詞使飄動;使慌張
The birds are fluttering their wings as they try to fly

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棒球空氣動力學 (Baseball Aerodynamics)

26:58棒球空氣動力學 (Baseball Aerodynamics)