These strands of molecules twine around each other to form cable-like structures.这些分子链彼此缠绕，形成缆线状的结构。There are wide variations caused by different academic programme structures.不同的教学项目结构造成了巨大的差异。Family structures are weak...
Plants are the ultimate source of all foodstuffs.植物是所有食物的最根本来源。Imports of foodstuffs accounted for a small proportion of total imports.食物进口仅占总进口额的一小部份.Many basic foodstuffs, such as bread and milk, are tax - free .许多基本食物...
In a straight fight the crusaders usually won; in skirmishes, the Saracens often overcame their more numerous opponents.单打独斗,十字军战士通常会赢; 在小规模战斗中, 撒拉逊人经常能以少胜多.The Crusaders believed they were fighting for a noble cause.十字军...