7.a piece of sth
(item)一件…；一个…
a sensitive piece of equipment used to detect radiation一台探测辐射的高灵敏度仪器
What's this piece of machinery for?这台机器是做什么用的？
8.a piece of sth
(instance)(事项的)条, 则, 项, 件
It is a highly complex piece of legislation.这是一项非常复杂的法规。
a highly interesting piece of information一则十分有趣的信息
a piece of advice一条建议
What a piece of luck!真是一桩幸事啊！
9.<英>(coin)硬币
a 10p piece一枚10便士的硬币
10.(for game)(棋类游戏等中的)棋子