The aim is to reverse the decline in the number of tree species or at least to preserve the "genetic material" of all of them.

其目的是扭转树种数量下降的趋势，或至少保存所有树种的“遗传物质”。

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materialType — Returns a number that identifies whether the Material object has a color (0), a texture (1), or both (2)

materialType — 返回一个数字，表明 Material 对象是否具有颜色（0）或纹理（1），还是两者都有（2）

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The assumed symbolic role of red ocher, said Dr. Henshilwood, comes from the large amounts of the predominantly red material found at a number of African sites as old as 160, 000 years.

亨希尔·伍德博士说，红色赭石的假设的象征性作用来自大量普遍的红色材料。这些在许多非洲遗址上发现的红色材料已达16万年之久。

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We are in active contact with our Customer Support operations and are aware of a small number of instances of material separation.

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Joe Decker, a Wikipedia admin for almost 2 years, points out that there are other larger, more difficult issues that the community has to tackle, including how to cope with the quickly decreasing number of unwritten subject material.

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