She was fitted with a pacemaker after suffering serious heart trouble.
她在心脏出了严重问题后装上了心脏起搏器。
A healthy human heart normally has a small group of special cells called pacemaker cells.
健康的人类心脏一般都有一小组称作起搏细胞的特殊细胞。
A healthy human heart normally has a small group of special cells called pacemaker cells.
健康的人类心脏一般都有一小组称作起搏细胞的特殊细胞。
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