You cannot take a day off without authorization.未经批准你不得休假。It's annoying to have to get authorization for spending such piddling amounts of money.花这麽一点钱也要去请示,真烦人.Formal authorization for the trip was given last week....
Lectin is a large molecule glucoprotein and can agglomerate the cell.凝集素是一种能作用于细胞使其凝聚的大分子物质,大多属糖蛋白.The structure of the chlorophyll molecule is known . It consists ofporphyrin.叶绿素的分子结构已经搞清, 它是由卟啉组成的.Scientists call this ...
wild and farmed salmon野生和人工养殖的鲑鱼He farmed in the south for many years.他曾在南方务农多年。Now are also hatcheries in which fish are farmed.现在也有一些鱼苗孵化场可以人工养殖鱼类.Many animals may be farmed or ranched to create a valuable legal trade....