1.Yet another longstanding mystery is why Mercury has a magnetic field.
另一个悬而未决的谜团是为什么水星上有磁场。
magˌnetic ˈfield/; NAmE/nounan area around a magnetor magneticobject, where there is a force that will attract some metals towards it 磁场magˌnetic ˈfield/; NAmE/
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