But the fact is, hemoglobin's affinity for oxygen isn't always the same.

但事实是，血红蛋白对氧气的亲和力并不总是一样的。

Second, HbH has very high affinity for oxygen, and doesn't release oxygen to the tissues.

其次，HbH对氧的亲和力很高，氧很难被释放给组织利用。

The hotter the iron, or really any metal gets the greater its affinity for oxygen becomes.

铁越热，或者任何一种金属，都会变得和氧气的关系更密切。

And it has super duper high affinity for oxygen, about 100 times that of normal Hb!

它对氧的亲和力极高，大约是正常血红蛋白的100倍！

Those ions bind to the hemoglobin, changing its shape yet again, further lowering its affinity for oxygen.

这些离子与血红蛋白结合，再次改变其形状，进一步降低其对氧的亲和力。

Hemoglobin has a high affinity for oxygen, enabling erythrocytes to carry large amounts of oxygen through the blood.

血红蛋白对氧具有高亲和力，允许红细胞通过血液携带大量的氧气。

In some places, we want our hemoglobin to have a high affinity for oxygen, so it can easily grab it out of the air.

在一些地方，我们希望我们的血红蛋白对氧气有很高的亲和力，因此它可以很容易地从空气中抓住它。

And in others, we want it to have a low affinity for oxygen oxygen, so it can dump those molecules to feed our cells.

在另一些情况下，我们希望它对氧气的亲和力很低，所以它可以丢弃这些分子来喂养我们的细胞。

Carbon dioxide triggers the release of oxygen, too, because it also binds to the hemoglobin, changing its shape again, lowering its affinity for oxygen still more.

二氧化碳也会触发氧气的释放，因为它也会与血红蛋白结合，再次改变其形状，进一步降低其对氧气的亲和力。

Once again, this decrease in hemoglobin affinity for oxygen in our tissues frees up oxygen so it can be used by our cells.

同样，血红蛋白对组织中氧的亲和力的降低释放了氧气，因此可以被我们的细胞利用。