以下为句子列表：
英文: Soundboard ribs are of spruce and are fully let-in to a notched liner (uprights) and the rim (grands) to support the soundboard crown and prevent the piano from losing its tone.
中文: 音板肋木也由云杉制成，完全嵌入锯齿状衬垫（直身钢琴）或琴身（三角钢琴），用以支撑音板的冠状顶部和稳定钢琴音质。
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英文: Specially designed closing rims make the upright soundboard irregular in shape (more like a grand), and improve its acoustical properties.
中文: 特别设计的外壳使直身钢琴的音板更像三角钢琴，更能提升听觉享受。
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