The utility model provides a trigonal pencil which consists of a pencil core and a pencil body, and is characterized in that the trigonal pencil body is arranged on the periphery of the pencil core.

本实用新型提供一种由铅笔芯和铅笔体组成的三棱 铅笔，其特征是：在铅笔芯外围设置一三棱柱形铅笔体。

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To study tree rings, researchers generally take a pencil-sized core from a tree.

为了对年轮进行研究，研究人员通常会从树木取出一块铅笔大小的核心部分。

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The latex with higher core T_g has more obvious core-shell structure, and the pencil hardness of the film is higher.

较高的核玻璃化温度则有利于形成明显的核壳结构乳胶粒子，且有助于漆膜硬度的提高。

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