【英语时差8,16】落叶美景从何而来（下）

For leaves that turn red or purplish, a different process occurs. Reddish pigments² are manufactured in the leaf as summer ends, created from sugars that are trapped in the leaf by that same cork-like growth of cells. Cool late-summer nights work best for retaining these sugars in the leaves, and sunny late- summer days are best for converting the sugar to pigment¹. Finally, some leaves like oaks have rich brownish pigments, due to tannins in the leaves. Since the most spectacular autumn displays will combine all these colors, you’ll want sunny days and cool nights in the late summer for the most spectacular natural fireworks in the fall.

1 pigment   

n.天然色素，干粉颜料

参考例句：

• The Romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。
• Who thought he might know what the skin pigment phenomenon meant.他自认为可能知道皮肤色素出现这种现象到底是怎么回事。

2 pigments   

n.（粉状）颜料( pigment的名词复数 )；天然色素

参考例句：

• The Romans used natural pigments on their fabrics and walls. 古罗马人在织物和墙壁上使用天然颜料。 来自辞典例句
• The original white lead pigments have oxidized and turned black. 最初的白色铅质颜料氧化后变成了黑色。 来自辞典例句