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。

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The utility model is characterized in that the arc-shaped comb teeth and the comb handle are carved with the skidproof grains and the upper ends on the ends of the comb teeth are made into circles.

它是由梳柄、梳体、直梳齿、弧形梳齿、梳齿端、防滑纹成，其特征是弧形梳齿、梳柄上刻有防滑纹、梳齿端上末端呈圆形。

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And how to safeguard the behoof of the victim and how to handle the cases caused by upper unknown falling thing have been controversies in juridical practice and academic circles.

如何保护受害人的利益，如何处理高空坠落物致人损害的案件已经成为实务界和学术界的争议焦点和难点。

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These small classes and lab work encouraged students to form tight friendships, but Mr. Holmes remained outside those inner circles for the most part, one person who took several upper-level classes with him said.

WSJ: Shooting Suspect's Behavior Provided Few Clues