打开

dǎ kāi to open; to show (a ticket); to turn on; to switch on

：bb77net 买

mǎi to buy; to purchase

球网

qiú wǎng net (for ball games)

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