The condition of an exchange force has nothing to do with isospin.
交换力的条件与同位旋完全无关。
The influence of the traffic air exchange force on ventilation in tunnels is not negligible.
交通换气力对隧道通风的影响是不容忽视的。
The influence of the traffic air exchange force on ventilation in tunnels is not negligible.
交通换气力对隧道通风的影响是不容忽视的。
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