The book follows four characters, loosely based on my uncles.该书描述了4个角色，大致上以我的几个叔叔为原型。A curl of black hair fell loosely across his forehead.他的额头上垂着一绺散开的黑色卷发。His shirt hung loosely over his thin shoulders.衬衫在他单薄肩膀的支撑下显得松松垮...
Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.Oil - yielding organic matter is contained in the shales.在这些页岩里有产油的有机物质.Alternating sandstones and shales are regarded as important.蚀变的砂岩和页岩是很重要的....