imaginary_axis_cone_有道手机词典

1.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。
dict.yoduao.com