n. xanthein ; xanthophyl ; xanthin
众所周知，拥有红色或黄色色素的赭石岩一直被广泛运用于绘画中，但却少有证据显示它是如何制作并运用的。
It was known that ochre-rock with red or yellow pigments-was used for paint even that far back in history. But there was scant evidence for how it was prepared and handled.
然而，至今仍不完全清楚，为什么有些树木倾向于制造红色素，而有些树木不去刻意制造色素，但还是会呈现出橙色或黄色。
What is still not fully understood, however, is why some trees resort to producing red pigments while others don't bother, and simply reveal their orange or yellow hues.
目的是比较不同干燥方法对红花提取物中有效成分羟基红花黄色素A 的影响。
The objective was to compare the different dehydrations on contents of Hydroxysafflor yellow A in Carthamus tinctorius L. extracts.
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