... 虚锥 imaginary cone 虚自变量 imaginary argument 虚自变数 imaginary argument ...
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... 点状腐蚀|pitting corrosion 点锥|imaginary cone 点着|burn ...
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imaginary axis cone 虚锥
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When an air jet is allowed to expand freely, the moving air is contained within an imaginary cone whose axis is coincident with that of the air jet.
当一股气流自由膨胀时，运动着的气流构成一个假想的圆锥体，其轴线与气流的轴线相重合。
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