Paleolithic man could only make the most basic stone tools.
旧石器时代的人类只能制造最简单的石器。
No. They were roughly done in three periods, Paleolithic Period;
大概是分成3个不同时期完成的，即旧石器时期；
Similar stone circles are found throughout the upper and lower paleolithic.
类似的石圈在旧石器时代早期和晚期都曾发现。
The microlithic tool tradition appeared in the late paleolithic period.
到旧石器时代晚期，同时存在细石器技术传统的产品。
The microlithic tool tradition appeared in the late paleolithic period.
到旧石器时代晚期，同时存在细石器技术传统的产品。
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