显然，试图解释和预测磁场变化的地球物理学家必须了解外核发生了什么。
Clearly, geophysicists who seek to explain and forecast changes in the field must understand what happens in the outer core.
出资证明书的编号和核发日期。
the serial number and date of issuance of the capital contribution certificate.
现在开发油田的许可证以龟速核发颁授。
Licences to develop oil fields are being awarded at tortoise speed.
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