The criteria for tooth selection dictated no pretreatment with a chemical agent such as alcohol, formalin, or hydrogen peroxide, or any other form of bleaching.

牙齿挑选标准规定未做过像酒精、甲醛、过氧化氢和其他漂白剂等化学用品预处理。

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Indeed, Darwin's Origin of -species by Means of Natural Selection, -published in 1859, seemed to vindicate Tennyson's adage from 20 years -earlier, of "nature red in tooth and claw".

实际上，1859年出版的达尔文著作《物种起源》似乎印证了坦尼森此前二十年的名句——“在尖牙利爪之下，自然是红色的”。

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The paper describes the selection of two important design parameters-tooth ta-per and cutter diameter.

论述弧齿锥齿轮的两个重要参数——轮齿收缩型式和刀盘直径的正确选择。

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