网址

wǎng zhǐ website; web address; URL

：bt55net office 教程

jiào chéng lecture course; teaching module at university; tutorial; textbook; course of study

网

wǎng net; network

平台

píng tái platform; terrace; flat-roofed building

介绍

jiè shào to introduce (sb to sb); to give a presentation; to present (sb for a job etc); introduction