MrGuoisateacherfromX的精選

問題詳情：  Mr.GuoisateacherfromXi’an.HeaskedhisstudentstohandintheirhomeworkthroughaQRcode（二維碼）.“Wespentanhourortwoinclasslearninghowtogenerate（使產生）thecodes,andintheendeverythinggetseasier.”Said...