The functions of their diffuseness, orientation, agglomeration, catalyzer and controls are indispensable factors of science development. 其传播功能 、 导向功能 、 凝聚功能 、 催化功能和控制功能等等是科学事业发展中必不可少的重要因素.
它们有哑铜的，古铜的和镀银的。They are available in polished brass, antique brass or silver-plate.这些刀叉并不像看起来那样值钱, 它们都是镀银的.The knives and forks are not as valuable as they look; they've only been plated with silver.啊, 那些高楼大厦 、 华灯 、...