| 单词 | magnetic reversal |
| 释义 | magnetic reversalmagˌnetic reˈversal (also polar reversal) noun [countable, uncountable] science, physics a complete change in the Earth’s magnetic field so that the needle of a compass begins to point in the opposite direction. Scientists believe this last happened about 780,000 years ago and that it has happened many times during the Earth’s history, but they do not know what causes it. |
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