材料方面的英语翻译？

qwert

Optical properties
Optical properties govern the material's reaction to light . These properties include :
. Opacity   the degree to which a material obstructs visible light.materials with high opacity are said to be opaque .low-opacity materials are called transparent .
. Color   the  appearance of the material which depends on the spectrum of light it reflects to the human eye .
. Transmittance  the measure of the amount of light transmitted by a material . The opposite of transmittance is reflectance . Window glass has high transmittance while polished aluminum has high reflectance .
Acoustical properties
Acoustical properties describe a material's reaction to sound waves. The most important acoustical property is the sound insulating or absorbing quality of the material. This is the ability of the material to absorb sound and is called its sound absorption coefficient . Most ceiling tile has high sound absorption coefficients to reduce echoes in a room.

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光学性能
材料对光的反应取决于材料的光学性能。这些性能包括：
·不透明性 即材料阻挡可见光的程度。具有高不透明性材料被称为不透明材料。具有低不透明性的材料被称为透明材料。
·颜色    即材料的外貌。取决于材料反射到肉眼中的可见光光谱。
·透射率 可见光透射材料的光通量的测量。相反的是反射率。如窗玻璃具有高的透射率而抛光过的铝具有高的反射率。

声学性能
声学性能是描述材料对声波的反应。材料最重要的声学性能是隔音或声吸收。它是材料吸收声波的能力，即所谓的吸声率。如大部分吊顶板材就具有高的吸声率以降低房间中的回声。