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Recent progress on surface modifications of TiO2 doped by metal cation and metalloid anion has been summarized,based on the findings reported in the present literatures.

早期的研究主要集中在悬浮体系即TIO：粉末上，但目前悬浮相TIO：光催化剂在水中易凝聚、易失活、且使光的穿透力受阻，尤其是处理后的光催化剂分离与回收的难题已成为该项技术能否工业化的关键。

The dome being constructed of a rigid material such as a metal, an alloy, a metalloid such as, but not limited to, titanium, aluminum, and boron, or a combination thereof.

该穹顶由例如金属、合金、非金属这样的刚性材料所构成，例如钛、铝和硼或其组合，但是不限于此。

In 1913 Harry Brearley, a metallurgist, was trying to find a metal suitable for making gun barrels.

1913年，一位名叫哈里·布里尔利的冶金家试图发现一种适合做枪管的金属。

Work to the metallurgist is any operation that changes the shape of a metal part without changing its volume.

冶金学家所说的加工，即改变金属形状、不改变体积的任何操作过程。

The metallurgist has recently found a metal skin for missiles and supersonic planes,one that will retain its strength at the high temperature caused by air friction.

冶金学家最近发明了一种用于导弹和超音速飞机的金属外壳，这种外壳在大气摩擦引起的高温下仍然能保持其强度。

The physical metallurgist who has long been relied upon by the industrialist to solve immediate problems, even though it may have been at the expense of his fundamental work on the understanding of the overall behavior of metals and alloys, is now tempted to desert to the ranks of the metal physicists.

长期以来，工业家一直依靠物理冶金家去解决一些迫切的问题，而现在物理冶金家却想改行加入到金属物理学家的行列，尽管他所受的培训并不利于他从事新的职业——研究金属和合金的总体特性。

The metallurgist has recently found a metal skin for missiles and superonic planes, one that will retain its strength at the high temperature caused by air friction.

personal version：最近冶金学家发现了一种可以用作导弹和超音速飞机外壳的金属，这种金属能在空气摩擦而产生的高温下保持其硬度。

Heat treatment is a main way of improving metal material and metalwork.

热处理是提高金属材料及其制品质量的重要手段。

Heat treatment is a main means of improving metal material and metalwork.

热处理是提高金属材料及其制品质量的重要手段。

" Spinning In metalwork, a technique for making hollow metal utensil s and artifacts."

旋压：金属制品中一种制作空金属容器和人造物品的技术。

We are in a good position to meet your requirements.

我们完全可以满足你方的需求。

We are all pervade d with a sense of disaster.

我们普遍有大祸降临的感觉。