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 |
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 |