雅思阅读辅导：计时工具的发展和应用

　　阅读段落

　　Today, highly accurate timekeeping instruments set the beat for most electronic devices. Nearly all computers contain a quartz-crystal clock to regulate their operation. Moreover, not only do time signals beamed down from Global Positioning System satellites calibrate the functions of precision navigation equipment, they do so as well for mobile phones, instant stock-trading systems and nationwide power-distribution grids. So integral have these time-based technologies become to day-to-day existence that our dependency on them is recognized only when they fail to work.

　　段落大意

　　本段主要是总结了计时工具的最新发展和应用，指出人类已经对他们产生了很大的依赖。

　　阅读笔记

　　Highly accurate timekeeping instruments most electronic devices

　　Computers: a quartz-crystal clock

　　Time signals calibrate the functions:

　　Global Positioning System satellites

　　Mobile phones

　　Instant stock-trading systems

　　Nationwide power-distribution grid

　　Conclusion: time-based technologiesday-to-day existence dependency on them

　　逻辑关系

　　1. 并列

　　Nearly all computers contain a quartz-crystal clock to regulate their operation.

　　Not only do time signals beamed down from Global Positioning System satellites calibrate the functions of precision navigation equipment, they do so as well for mobile phones, instant stock-trading systems and nationwide power-distribution grids.