Walkerite
镁针钠钙石
🗣️ 情景例句
You must develop the muscles of your speech organs to produce unfamiliar sounds.
所以你必须训练和发展你的发音器官（声带、舌、口、鼻腔等）的肌肉，以便发出陌生的（另外一种语言）声音。
Pat, pat. He is patting the kid on his head.
拍，拍。他在轻拍着那个小孩的头。
Yes, they fit very well.
不错，都很合身。