Nitric oxide (NO) is a gas of small molecule with toxic properties, but it is also a biologically active substance involved in numerous pathologic and physiologic processes.

一氧化氮(NO)是一种不稳定的小分子有害气体，又是一种生物活性物质，参与了多种疾病的病理生理过程。

youdao

How does belly fat increase risk of heart disease? 'Fat isn't an inert substance, ' says the NHLBI's Dr. Lauer. 'It's biologically very active tissue. '

肚子上的脂肪怎么会导致心脏病风险的上升？心肺血液研究院的罗尔博士说，“脂肪不是无生命的组织，其实它是非常活跃的。”

youdao