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Angina is a chest pain that occurs when the blood supply to the muscles of the heart is restricted. It usually happens because the arteries supplying the heart become hardened and narrowed.

心绞痛 是 当 向 心脏 肌肉 的 血液 供应 受到 限制 时 发生 的 胸痛。它 发生 通常 因为 供应 心脏 的 动脉 变硬 和 变窄。