THREE:Considered mechanically as a means of handling material, the human hands are capable of exerting force in any direction, vertically, horizontally, or at any angle, moving at various rates of speed, as the conditions may require, and with varying force within the limits of human strength. These functions enable us to pick up or lay down a weight slowly and carefully, to transport it at a rapid rate to save time, to move it in any direction, and without the least waste of power, except in the case of carrying small loads, when the whole body has to be moved, as in ascending or descending stairs. The power travelling cranes, that are usually employed in machine-fitting establishments, are perhaps the nearest approach that has been made to the human frame in the way of handling mechanism; they, however, lack that very important feature of a movement, the speed of which is graduated at will. It is evident that in machinery of any kind for handling and lifting that moves at a uniform rate of speed, and this rate of speed adapted, as it must be, to the conditions of starting or depositing a load, much time must be lost in the transit, especially when the load is moved for a considerable distance. This uniform speed is perhaps the greatest defect in the lifting machinery in common use, at least in such as is driven by power.Quickly he summoned an orderly and gave some orders, and a few minutes later four more officers drew round the table, on which a large map of Belgium was displayed. Their tone became at once charmingly sweet and kind, and a soldier offered me some lemonade from small bottles kept cool in a basin filled with cold water.
[摘要]在秋季宝宝最常见的疾病就秋季腹泻，所以妈妈更要这时为宝宝的胃肠道做好保护，让他们吸收更多的营养物质，抵抗细菌、疾病的侵袭。
