The draft has a lot of the same ideas so you can get a good idea for what Art of R Programming is about, although from a quick scan, the final is more polished and contains more material.

它里面包含很多相似的观点，因此你可以充分了解到R编程的艺术是什么。虽然很短，但是完稿经过进一步的润色，将会包含有更多的材料。

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Non-poisonous, good light-resistant and heat-resistant color was used for manufacture of the color master batch applied for PP-R, PP-B pipe materials.

采用无毒、耐候性好、热稳定性高的颜料制得PP-R、PP-B管材料专用色母粒，考察了色母粒对PP-R、PP-B管材料力学性能、耐热性、耐光性、卫生安全性的影响。

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