乐天

lè tiān carefree; happy-go-lucky; optimistic

堂

táng (main) hall; large room for a specific purpose; CL:間|间[jian1]; relationship between cousins etc on the paternal side of a family; of the same clan; classifier for classes, lectures etc; classifier for sets of furniture

客户端

kè hù duān client (computing)

app 下载

xià zǎi to download; also pr. [xia4 zai4]

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

ac123·net fdz