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White blood cells, which are part of the immune system, and platelets, which help with blood clotting at a site of injury, also float in plasma.
白細胞是人體免疫系統的一部分而血小板則在人體傷口處起到凝血作用，這兩種血細胞也都漂浮在血漿上。
They have much shorter life spans than red cells and also are replaced continuously.
但是它們的存活周期要比紅細胞短，同時也會被不斷地更新。
If you've ever seen a bone cut crosswise, with soft tissue called marrow inside, then you've seen where blood cells are made.
如果你看到過一塊被橫切的骨頭，你就會看到里面的軟組織，即骨髓，它是專門制造血細胞的。
Bone marrow contains special blood cells, which constantly divide to produce new cells to replace the ones that have been destroyed.
骨髓含有特殊的血細胞，這種細胞會不斷分離產生新的細胞來取代那些已被破壞的細胞。
Why all this bloody business in the bone marrow?
為什么所有的造血工作都在骨髓中進行呢？
The body's process of forming new blood cells helps you recover if you lose blood to an injury,
答案是如果你因受傷而流血的話，人體生成新血細胞的過程便能幫助你復原，
and it also helps blood perform its many functions despite cell damage and loss.
同時，盡管存在細胞受損或缺失，這個過程也能幫助血液發揮很多其它的功能。
譯文來自可可英語
