defence mechanism
英 美
Pain acts as a natural defence mechanism.
疼痛算是一种自然防护机制的作用。
It's human nature - and it's often a valuable defence mechanism.
这是天性,而这常常是一种宝贵的防御原理。
The pulmonary macrophages are the body's primary defence mechanism to contain M. tuberculosis.
肺泡巨噬细胞是人体防御肺结核类疾病的基本保障。