precision
/prɪˈsɪʒn; prɪ`sɪʒən/ n[U]
1 (also preciseness) exactness and clarity; quality of being precise(1) 准确（性）; 明确（性）; 精确（性）
Your report lacks precision. 你的报告不够准确.
Aim for more precision in your style. 写东西时要力求准确.
2 accuracy 精密（度）: clockwork precision 无比精确
The diagram had been copied with great precision. 该图表的复制件极精确.
[attrib 作定语]
precision timing 恰到好处的时机
precision instruments/tools, ie those designed for very accurate work, measurements, etc 精密仪器[工具].