同素异形体

This finding shows that all allotropic carbon forms known up to date can be produced in nature, and high temperature, pressure, catalysts particles seem to play an important role in producing carbon nanotubes.

该发现表明迄今为止所有碳的同素异形体均可产于自然界，并且高温、压力、催化剂颗粒在产生纳米碳管的过程中起到了非常重要的作用。

An element such as carbon has several allotropic forms.

一种化学元素具有几种同素异形体，比如碳元素。

A pale yellow nonmetallic element occurring widely in nature in several free and combined allotropic forms.

硫，硫磺：一种浅黄色的非金属元素，以几种游离的或化合物的同素异形体形态，广泛地存在于自然界中。

A metallic element having four allotropic forms, the most common of which is a hard, extremely brittle, lustrous, silver-white, crystalline material.

锑：一种金属元素，有四个同素异形体，最常见的是一种硬而脆的银白色发光晶体物质。

This article analyses some basic conceptions that are comparatively vayue or even wrong wrong in the teaching of middle school chemistry, like the definition of chemical change, the influence of concentration on a chemical reaction , the structure of oxacid,and the acidity of sulfuric acid, the acidity of carbonic acid, and the conversion of allotropic substance.

分析了中学化学教学中的几个比较模糊甚至错误的基本概念，如化学变化、浓度对化学反应速度的影响、含氧酸的结构、硫酸的酸性、碳酸的酸性、热化学方程式的表示法、同素异形体间的转化等，并从大学化学角度加以澄清，以便使大一学生更准确地理解和掌握这些基本概念。

Fullerene is the third allotropic form of carbon besides diamond and graphite, C60 is the representative in the fullerenes.

富勒烯是继石墨，金刚石后出现的碳的第三种同素异形体，其中C60是最典型的一种，由于其独特的结构和性能，使得它在生物，化学，材料，纳米科学等领域显示了巨大的应用潜力。

A multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms.

一种多价的氮族非金属元素，通常见于无机磷酸盐岩石中或作为有机磷酸盐存在于活细胞中，极其活跃，有多种同素异形体。

An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds.

一种丰富的非金属四价元素，有三种同素异形体：无定形碳、石墨、金刚石。

Shown here are two allotropes of carbon: diamond and graphite.

这里展示的是两种碳的同素异形体：金刚石和石墨。

At present,industrial artificial diamond technic is a conversion of carbon from graphite structure to diamond structure by the effect of catalyst alloy at high temperature and high pressure.

1引言金刚石和石墨是碳的两种同素异形体，化学成分都是纯碳，人造金刚石是在高温高压下经过触媒作用将石墨结构发生转变的结果。

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。