凌空

líng kōng be high up in the sky

签名

qiān míng to sign (one's name with a pen etc); to autograph; signature

官方

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

常见问题

cháng jiàn wèn tí common problems; FAQ

解答

jiě dá answer; explanation; solution (to a math equation)

教程

jiào chéng lecture course; teaching module at university; tutorial; textbook; course of study

TG:@Yunyingpaiqoy