Blood flow is redirected towards only the most essential organs like the heart, lungs, and brain, which rely on reserve oxygen stored in blood and muscle.

血液流向被改变，仅流经最重要的器官，如心脏，肺和大脑，这些器官依赖于血液和肌肉中储备的氧气。

But the donor pool isn’t very big, especially for essential organs like hearts and lungs that can only be donated when someone dies.

但是供体库不是很大，尤其是像心脏和肺这样只有在人死后才能捐献的重要器官。

Their fall is foretold in their structure; but the leaves are renewed every year, and so also are the essential organs wood, roots, bark, buds.

他们的堕落在他们的结构中被预言； 但是叶子每年都会更新， 重要的器官木材、根、树皮、芽也是如此。

And because the hagfish's skin is so loosely attached to the rest of its body, the pressure from the bite causes the hagfish's essential organs to slip out of the way, avoiding damage.

这是因为盲鳗的皮肤松散地连接着其他的身体部分，鲨鱼咬合的压力导致盲鳗的重要器官从皮肤中脱落来避免伤害。