heart,心，心脏，beat,击打，跳动。

1. Experimenters have succeeded in controlling the rate and regularity of the heartbeat.

实验者已经成功控制了心跳的速度和频率。

2. She was taken to hospital suffering from an irregular heartbeat.

她因心律不齐被送往医院。

3. I was a little breathless and my heartbeat was bumpy and fast.

我有点儿喘不上气，心脏咚咚地快速跳动着。

4. Your baby's heartbeat will be monitored continuously.

宝宝的心搏将会受到持续监控。

5. She felt her heartbeat quicken as he approached.

随着他的走近，她觉得自己的心跳加速了。