If the cause is unknown, then you should perform a full recovery of the instance.
如果原因不明，那就应当执行实例的完全恢复。
Then we use the triangular-centroid method to estimate the location of the unknown nodes.
然后再利用三边循环法估计未知节点的位置。
He was an unknown novelist then.
它的大部分对我是未知的。
He was an unknown novelist then.
当时他是位不出名的小说家。
He was an unknown novelist then.
当时他是位不出名的小说家。
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