Heavy elements are equally essential for life: Witness the oxygen we breathe, the calcium in our bones, the iron in our blood.

重元素同样是生活的必需品：其证据是我们呼吸的氧气、我们骨骼中的钙、我们血液中的铁。

youdao

At his annual physical, a routine blood test revealed something was wrong with his bones.

在年度体检中，一项常规血液检查显示他的骨头出了点问题。

youdao

All blood cells are produced in the bone marrow. As children, most of our bones produce blood.

所有血细胞都在骨髓中生产。对孩子们来说，我们的大多数骨骼都产生了血细胞。

youdao

Still,broken bones should be treated quickly because they can restrict blood flow or cause nerve damage.

VOA: special.2009.02.04

Blood I will mass and cause bones to be.

我要将血液集合起来，把它做成骨头。

耶鲁公开课 - 旧约导论课程节选

He saw the clean bones lying gray against the frozen blood.

VOA: special.2010.02.27