正规

zhèng guī regular; according to standards

买

mǎi to buy; to purchase

足球

zú qiú soccer ball; a football; CL:個|个[ge4]; soccer; football

app 排行榜

pái háng bǎng the charts (of best-sellers); table of ranking

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

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