问题描述：
分析一下这个句子的结构、语法.
Scientists have been baffled as weeksand sometimes months have gone by without a single sunspot,in what is thought to be the deepest solar minimum for almost 100 years.
Scientists have been baffled as weeksand sometimes months have gone by without a single sunspot,in what is thought to be the deepest solar minimum for almost 100 years.
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