還書箱 (waan4 syu1 soeng1) — drop-in box (for return of library books) in Cantonese
waanˎ₄還syuˉ¹書soengˉ¹箱简 还书箱
Mandarin Pinyin: huan2 shu1 xiang1
Meaning of 還書箱
noundrop-in box (for return of library books)
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