Because they are not metabolised, these molecules are referred to as "refractory".

因为这些分子不能被代谢，所以被称为“难解质”。

youdao

Those with higher levels of para-cresol sulphate, made from para-cresol produced by bacteria in the gut, metabolised paracetamol less effectively than those with lower levels.

肠道细菌产生对甲酚，对甲酚又形成硫酸对甲酚。尿中含有高水平硫酸对甲酚的人比含低水平硫酸对甲酚人代谢对乙酰氨基酚慢。

youdao

The scans, which used a technique called positron emission tomography (PET), were designed to monitor changes in the way the brain metabolised glucose, the fuel it needs to function.

扫描利用了一种叫做正电子发射X射线层析照相术(PET)的技术。 扫描用以监测脑中代谢葡萄糖（脑正常工作需要的营养物）的变化。

youdao