Those in mammalian cells, the cerebrosides and gangliosides, may perform similar functions.在哺乳动物细胞中脑磷脂和神经节苷脂可能执行同样的功能.Starfish contains different types of bioactive materials, such as proteins, enzymes, steroidal glycosi...
有多少白人家庭生活于赤贫之中?How many white families have lived in stark poverty?自有人类生存以来,大多数人生活于贫困之中, 饱受饥饿之虞.For all existence most men have lived in poverty, threatened by hunger.在一块丰饶的土地上, 家家都不容生活于绝望的贫困中.In a land of great wealth, ...