官方

guān fāng government; official (approved or issued by an authority)

网址

wǎng zhǐ website; web address; URL

：cc55net 威廉

Wēi lián William or Wilhelm (name)

希尔

Xī ěr Hill (name); Christopher Hill, US undersecretary of state of East Asian affairs

专业

zhuān yè specialty; specialized field; main field of study (at university); major; CL:門|门[men2],個|个[ge4]; professional

版

bǎn a register; block of printing; edition; version; page

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