translation.en: And they're scientific models?  As you might have guessed, I'm a tissue engineer, and this is a video of some of the beating heart that I've engineered in the lab.
translation.zh: 还有他们是科学模特儿吗？  你们可能会猜对了，我是个组织工程学家 这段影片是在拍摄跳动的心脏 这是我在实验室设计的