To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么我们没有发现大量的属于这个纪还要早的时期的化石，我无法给出满意的答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么我们没有发现大量的属于这个纪还要早的时期的化石，我无法给出满意的答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么们没有发现大量属于这个比寒武纪还要早时期，无法给出满意答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什没有发现大量的属于这个比寒武纪还要早的时期的化石，无法给出满意的答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么我们没有发现大量的属于这个比寒武纪还要早的时期的化石，我无法意的答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对为什么我们没有发现大量属比寒武纪还要早时期化石，我无法给出满意答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么我们没有发现大量的属于这个纪还要早的时期的化石，我无法给出满意的答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对为什么我们没有发现大量属比寒武纪还要早时期化石，我无法给出满意答案。

To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.

对于为什么我们没有发现大量的属于这个比寒武纪还要早的时期的化石，我无法给出满意的答案。