该现象被称作舒曼共振——作为稳定的电磁节律，由闪电在地球表面与电离层之间反射所产生。
Wales: Student Finance Wales portal
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iPhone users can now officially download and install iOS 26.4, a new update that adds a variety of features. No one item by itself is earth-shaking. But collectively, they do offer several handy improvements, as well as the usual security patches.
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