隔音

soundproofing

to separate / to partition / to stand or lie between / at a distance from / after or at an interval of

sound / noise / note (of musical scale) / tone / news / syllable / reading (phonetic value of a character)

apostrophe, as used in pinyin orthography (i.e. to mark a boundary between two syllables, as in "dàng'àn" 檔案|档案[dang4 an4])