Calculating telephone fees/ per-second calculation/ per-minute calculation是什么意思

用法例句

The implementation and design of the commonly-used network billing systems based on counting expense by time are analyzed, and billing programs based on webpage, and the one based on server and customer are focused,respectively.

对目前按时计费的常用方式进行了分析比较,详细阐述了基于Web页面和基于服务器和客户端的计费方案,通过对开发过程中出现的问题以及使用的效果进行比较,得出每种方式的优缺点。