金属物质

Nanomaterials have many new characterizes which different from the normal materials for their small size, big surface area ratio and quanta dimension domino effect, for examples, the metal with good conductor will be turned into nonmetal when the size is reduced tonanometer levels; the resistance of originally nonconductor will be descended greatly when its size is reduced several nanometers or so, and loss the nonconductor property; the general solid is steady under certain conditions, while under nanometer conditions, the capabilities will be effected greatly by the granule sizes, the newness characteristics made nanomaterials have great appliance foreground on catalyze, optics, and industry produce and so on, therefore the nanomaterials have been the hotspot for materials science, chemistry science and so on.

纳米材料由于尺寸小、比表面积大和量子尺寸效应使它具有不同于常规固体材料的新的特征，如原来是良导体的金属，当尺寸减小到纳米量级时就变成非金属型；原来是绝缘体的物质，当尺寸减小到几纳米或几十纳米时电阻大大下降，失去了绝缘体特性；常规固体在一定条件下物理性能是稳定的，在纳米状态下，颗粒尺寸对性能产生强烈的影响等等，这些新奇的特点使得纳米材料在催化、光学、工业生产等各个方面都有着广阔的应用前景，因此，纳米材料目前已经成为材料科学、物理学及化学等学科的前沿热点。1990年7月在美国巴尔基摩召开了国际第一届纳米科学技术会议，正式把纳米材料科学作为材料科学的一个新的分支公布于世。

Most industrial products contain metal and nonmetal minerals. Therefore, investigating ecological rucksacks of minerals is of great significance.

由于大多数工业产品的主要物质组成是金属和非金属矿物，因此研究矿产资源开发的生态包袱具有重要意义。

Active metals , organic substances , and other ' oxidizable materials are always subject to slow attack by oxygen when exposed tO the ai r .

Version B ：活泼金属、有机物和其他可氧化的物质，当暴露在空气中时，总是容易受到氧缓慢的侵蚀。

During the process of paramecium cultivation, pH, temperature, natural enemies, organic compounds, metal ions are all factors which influence growth, in addition to cultivation medium.

在培养过程中除应关注所用的培养物质外，还应综合考虑pH、温度、天敌、有机化合物、金属离子对培养过程的影响。

Phytosterol is a kind of substance of physiological activity, which is directly extracted from plant through supercritical carbon dioxide extraction technology. Therefore, it does not contain any unidentified compositions such as organic solvents and metal ions, etc. It can be widely used in the industries of medicine, food and feed etc.

植物甾醇是一类具有生理活性的物质，采用超临界二氧化碳萃取技术直接由植物中提取而得，所以不含任何有机溶剂及金属离子等不明成分，能广泛应用于医药，食品，饲料等行业。

These include iron, nickel, cobalt, and some rare earth metals.

磁性物质是由铁、钴、镍等金属提炼而成。

Research on the reutilization and safe disposal of waste PCB has a great practical significance for its potential high value and environmental pollution.

废弃印刷线路板中金属的高回收价值与有毒有害物质的潜在危害性使得对其进行资源化回收和安全处置具有十分重要的意义。

In these regulations 'blasting process' means the cleaning, smoothing, roughening or removing of part of the surface of any substance or thing including granite, stone or brick by the use as an abrasive of a jet of sand, metal shot or grit or other material propelled by a blast of compressed air or steam or water or by a wheel.

在本规例中，"喷砂工序"指使用喷射砂粒、金属砂或粗砂或其他物料作为磨料，并以喷出压缩空气或水蒸汽或水或利用轮推动磨料的喷射，从而清洁、磨滑、磨粗或除去任何物质或物件(包括花岗岩、石块或砖块)的部分表面的工序。

Borax or tincal: Sodium tetraborate decahydrate Na2B4O5(OH4 H2O, a soft, light, colourless crystalline mineral used as a component of glass and pottery glaze s in the ceramics industry, as a solvent for metal-oxide slags in metallurgy, as a flux in welding and soldering, and as a fertilizer additive, a soap supplement, a disinfectant, a mouthwash, and a water softener.

硼砂：四硼酸钠Na2B4O5(OH4？H2O。它是既软又轻的无色结晶物质，有多方面用途；作为玻璃的成分，在陶瓷工业中作为陶器的釉料，冶金中作为金属氧化物炉渣的溶剂，作为焊接剂，并作为化肥的加料、肥皂的添加物，消毒剂、漱口剂和水的软化剂。

A mechanical or alloyed contact between different metals or other materials,as in a thermocouple.

接触在热电偶中，不同的金属或其它物质之间机械的或掺杂的接触

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。