Voiced /th/ HARD: breathe, feather, weather, this-that-these-those, mother, father, brother, leather, clothing, they, Unvoiced /th/ SOFT: tooth, bath, math, path, thief, think , thorn, thirty, Thursday, earth, wreath, north, birthday, throw, panther,

TH (hard or soft)

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恢復自動保存: ?