This is the 1522nd most frequent Chinese word.
血液
Blood.
In this sentence, '血液' is used in its literal sense, referring specifically to the blood as a physical substance within the human body.
血液在人体中循环，提供氧气和营养。
Blood circulates in the human body, providing oxygen and nutrients.
Here, '血液' refers to blood samples collected and studied for medical purposes, emphasizing its application in diagnosis.
作为医学生，我们学习了如何分析血液样本以诊断疾病。
As medical students, we learned how to analyze blood samples to diagnose diseases.
In this example, '血液' is used metaphorically to describe the vividness and life-like quality of her writings.