n.心跳；中心；重要特征
I can feel my heartbeat flunking out. 我可以感觉出自己的心跳得厉害.
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。
The candidate said that he understood that heartbeat of the Hispanic community in California. 这位候选人说他了解加利福尼亚州的西班牙语裔美国人社区的特点。
