And so we're able to evaluate not just lives as a whole, looking back at the pearly gate.

所以我们不仅能评估整个人生，当站在天堂门口回首人生时。

耶鲁公开课 - 死亡课程节选

It has a gate on it and that gate is in open or close state depending on whether a ligand is present or not.

在这个通道上有个门,这个门是打开还是关闭,取决于配体到来与否

耶鲁公开课 - 生物医学工程探索课程节选