时差N小时 关于人体造血你了解多少?(下)

White blood cells, which are part of the immune system, and platelets, which help with blood clotting¹ at a site of injury, also float in plasma².

白细胞是人体免疫系统的一部分而血小板则在人体伤口处起到凝血作用，这两种血细胞也都漂浮在血浆上。

They have much shorter life spans than red cells and also are replaced continuously.

但是它们的存活周期要比红细胞短，同时也会被不断地更新。

If you've ever seen a bone cut crosswise, with soft tissue called marrow³ inside, then you've seen where blood cells are made.

如果你看到过一块被横切的骨头，你就会看到里面的软组织，即骨髓，它是专门制造血细胞的。

Bone marrow contains special blood cells, which constantly divide to produce new cells to replace the ones that have been destroyed.

骨髓含有特殊的血细胞，这种细胞会不断分离产生新的细胞来取代那些已被破坏的细胞。

Why all this bloody⁴ business in the bone marrow?

为什么所有的造血工作都在骨髓中进行呢？

The body's process of forming new blood cells helps you recover if you lose blood to an injury,

答案是如果你因受伤而流血的话，人体生成新血细胞的过程便能帮助你复原，

and it also helps blood perform its many functions despite cell damage and loss.

同时，尽管存在细胞受损或缺失，这个过程也能帮助血液发挥很多其它的功能。

1 clotting   

v.凝固( clot的现在分词 )；烧结

参考例句：

• The study was also based only on the one anti-clotting drug. 所用抗血栓药物也仅限于一种。 来自互联网
• A plasma protein that is converted into thrombin during blood clotting. 凝血原酶一种血浆蛋白质，在血液凝聚时转化成凝血''。'酵'。''''。'素'。''。 来自互联网

2 plasma   

n.血浆，细胞质，乳清

参考例句：

• Keep some blood plasma back for the serious cases.留一些血浆给重病号。
• The plasma is the liquid portion of blood that is free of cells .血浆是血液的液体部分，不包含各种细胞。

3 marrow   

n.骨髓；精华；活力

参考例句：

• It was so cold that he felt frozen to the marrow. 天气太冷了，他感到寒冷刺骨。
• He was tired to the marrow of his bones.他真是累得筋疲力尽了。

4 bloody   

adj.非常的的；流血的；残忍的；adv.很；vt.血染

参考例句：

• He got a bloody nose in the fight.他在打斗中被打得鼻子流血。
• He is a bloody fool.他是一个十足的笨蛋。