这些颜色很瑰丽,但究竟为什么有些树会变成黄色或橙色,而有些树会变成红色或紫色,这个问题一直困扰着科学家。
The colours are magnificent, but the question of exactly why some trees turn yellow or orange, and others red or purple, is something which has long puzzled scientists.
我喜欢亮丽的色彩:红色或紫色是我最喜欢的颜色。
欧亚的一种植物,具有疏松的粉红色或紫色总状花序、有刺的茎和坚韧的根。
Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots.
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