程序性细胞死亡是细胞生理性死亡最常见的形式，是细胞对其周围环境信号的主动反应。
Apoptosis is the most common form of cell death in physiological condition, and is an active reaction of cells to surrounding signals.
婴儿早期就学会的一件事是他们的行为影响其他人的反应——他们意识到他们对身处的环境有主动影响力，因此世界不只是场声色表演。
One of the things infants learn early in life is that their actions affect others' responses—they sense that they're active agents in their environment, so the world isn't just a sound and light show.
他是关于嗅觉的震动理论的领军人物，这个理论认为当我们的鼻子闻到气味时，其实是我们的鼻子正在主动对正在闻的气味分子作出反应。
He's a leading proponent of the vibrational theory of smell — the idea that when our noses pick up a scent, we're reacting to the vibrational properties of the molecule we're smelling.
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