Carotenes are insoluble in water and soluble in oils and fats.胡萝卜素不溶于水，但可溶于油类和脂肪。There are over 600 known carotenoids ; they are split into two classes, xanthophylls and carotenes.有超过600种已知的类胡萝卜素,可以分为两类:叶黄素和胡萝卜素....
An earthworm is a terricolous organism.蚯蚓是陆生的生物.The earthworm population had declined by 70 %.蚯蚓数量下降70%.The oral opening in an earthworm is small.蚯蚓的口是很小的....
Bandanna handkerchiefs, too, are still made only in blue or red.现在一种印花大手帕也仍旧只染成蓝色或红色.He knotted the bandanna around his neck.他在脖子上系了一条印花大围巾。He wiped his forehead with a blue bandanna and smiled again.他用一条蓝色的大手帕擦擦前额,又笑了笑....