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This review introduces the generation of free radicals and its harm to human body, and discusses the relationship between free radicals and exercise.

介绍了自由基的产生及对人体的危害，并全面论述了运动与自由基的关系。

A free group is "free" in the sense that it is subject to no relations.

自由群是在它不服从任何关系的意义上称为自由的。

This paper studies the classification of two-dimensional representations of free group and free semigroup with tw...

本文研究具两个生成元的自由群和自由半群在任意域，特别是在有限域上的二维表示的分类问题。

Select "Free" from the price list if you wish to have your favorite apps free of charge.

选择"免费"从价格表，如果你想有你喜欢的应用程序是免费的。

This is a preview of Stock up on free photos with a list of free stock photo sites .

这是一个预览的股票就免费照片一份清单，免费股票拍照地点。

Love is free, free in love.

爱是自由，自由的爱。

Love is free,free is love.

爱是自由，自由是爱。

LOVE IS FREE, FREE IS LOVE.

爱情是自由，自由是爱情。

Is a system of free exchange, a free market economy.

是一种自由交换的体系，自由的市场经济。

Firstly, it's proved that the base of free monoid is unique, and that the equation of a base, a generating set and a irreducible generating set in the semigroup with length; Secondly, it's given the relation of a primitive word and a word of indecomposable--Let and is indecomposable, then is primitive ;And by using the length's method and chart,some properties of primitive word have been proved and the solutions of the equation , are discussed; Lastly, on the base of some proposition in Free monoids and Languages ,the proofs of some properties are improved by instruction. For example: Let be a primitive word over X, where .Then is a code. And let then if and only if {} is a code.

首先，讨论了含幺半群中基的基本性质及基与最小生成元集的联系，并给出了含幺半群中基、生成元集、不可约生成元集三者之间的关系；证明了在有唯一长度的半群S中，不可约生成元集、基、最小生成元集三者之间的等价关系；其次，讨论了字的组合与分解性，得出了字的本原性与不可分解性之间的关系---若为不可分解的，则一定是本原的，反之，不一定真；并运用图示法证明了字的可补性理论，讨论了方程，的可解性；在此基础上，用归纳法进一步证明了本原字与码的有关命题--若是X上的一个本原字，其中，则是一个码；若则当且仅当{}是一个码。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。