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One is that we've said the flux through them is zero anyway.
其中一个就是已经说过的，通过侧面的通量为。
youdao
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The flux through the wall of the vortex tube is zero by its definition.
根据涡管定义，穿过涡管管壁的涡量为零。
youdao
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The flux through the wall of the vortex tube is zero by its definition.
根据涡管定义，穿过涡管管壁的涡量为零。
youdao