1. Originally they were round pieces of metal with a hole in the center, so that a piece of string could keep them together. 最初它们是圆圆的金属片，中间有一个洞，这样一根绳子就可以把它们串在一起。
2. You can start previewing your custom information center as soon as you drag and drop one piece of content, such as a file, into the navigation view. 一旦将内容片断（比如文件）拖拽到导航视图后，您就可以开始预览定制的信息中心了。
3. Archaeologists have unearthed a second piece of the sunken ship that was discovered close to the old World Trade Center site in lower Manhattan in July, 2010. 2010年的7月，考古学家在曼哈顿下城靠近旧的世界贸易中心遗址的地方发现了第二件出土的沉船残骸。
4. If now I take a piece of putty and I put the piece of putty here, then clearly I change the location of the center of mass quite substantially. 我拿一块油灰，把它放这里，很明显我改变了，它的重心。
5. Place a clean dry folded piece of cheesecloth loosely over a bowl or a pitcher, and create a shallow well in the center. 将一片干净的干棉布折叠好松松地放在碗上或水罐上，在中间形成一个浅浅的窝。
