在许多细胞中,含量最高的磷脂是磷脂酰乙醇胺或脑磷脂.The most abundant phospholipid in many cells is phosphatidyl ethanolamine or cephalin.乙醇胺在气体的纯化和分离方面也是有用的.Ethanolamines are also of value in the purification and the separation of gases.利用不经提纯的棉...
画这幅画的时候，画家非常注意细节。The painting had been executed with meticulous attention to detail.他们同意将这幅画的价格提至4,500法郎。They agreed to bid the picture up to 4,500 francs.他画的画总是令人叹为观止。He always painted marvellously....