其上限由电离层的状态而决定. 辞典例句 The upper limit on F quoted above already excludes such an admixtxre due to electromagnetic interactions. 上面引用的F的上限已经排除了由电磁相互作用引起的这种混合. 辞典例句 The upper limit for party violation in this strong interaction was quoted by Tanner. ...