But then, how does its heart beat?

那它的心脏是怎么跳动的呢？

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In the laboratory, when the seal dives below the surface of the water and stops breathing, its heart beats more slowly, requiring less oxygen, and its arteries become constricted.

在实验室里，当海豹潜入到水面以下并停止呼吸时，它的心脏跳动得更慢，需要的氧气更少，动脉也会收缩。

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"We will rebuild this economy stronger than before,and at its heart will be three powerful words: Made In America."

VOA: standard.2010.08.11

So I haven't done magic, I've given you a really fast way to solve a knapsack problem, but it's still exponential deep down in its heart, in something.

所以我并没有施魔法，我已经告诉了你,一种快速解决背包问题的方法了,但是某些方面它的核心仍然是指数增长的。

麻省理工公开课 - 计算机科学及编程导论课程节选

But a framework in which to understand it is that pro-slavery ideology was, at its heart, a kind of deeply conservative, organic worldview.

支撑奴隶制度思想体系的框架,若要去理解这副框架的话,其核心,是某种极度传统,接近自然的世界观

耶鲁公开课 - 美国内战与重建课程节选

At its heart, a co-op is a non-profit, member-run system for providing insurance plans.

CNN: Dissecting a health care co-op

Its heart is a silicon chip containing several channels that narrow into a funnel.

FORBES: Health

For an America of compassion that opens its heart to those who cry out for help.

CNN: State of the Union Address