decibel GRE专八

The typical lawn mower makes about 90 decibels of noise.

典型机发出响约为90分。

This often limits their ability to truly differentiate their ambience from that of the fashion shop next door, which booms out teenybopper music at alarmingly high decibel levels.

常常限制了书店将自己氛围同隔壁时装小店区分开来能力，而那些时装店经常用高分喇叭播放着流行靡靡之音。

This paper described the basic concept and expressions of the decibel and Neper. It also explained some merits of the calculation rntes and Application ranges of the measuremeut Units.

本文阐述了分与奈培基本概念和表示方法，同时还说明了该计量单位优点、计算法则和应用范围。