It propels blood through vessels to each part of the body, delivering oxygen and other nutrients essential for normal function. The heart is vital because it.
它推动血液顺着血管流至身体各部位，并运载氧和必不可少的维持身体正常机能的营养素。
It propels blood through vessels to each part of the body, delivering oxygen and other nutrients essential for normal function. The heart is vital because it.
它推动血液顺着血管流至身体各部位，并运载氧和必不可少的维持身体正常机能的营养素。
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