Bacteria - We have many different strains of bacteria in our mouths.

细菌—我们口腔里是有不同类型的细菌的。

youdao

These are important antibiotics that new drug resistant strains of bacteria have evolved to resist.

这都是些重要的抗生素，而新抗药性品种的细菌正逐步对它们产生抗药性。

youdao

This can render powerful antibiotics, which are often the last defence against multi-resistant strains of bacteria, ineffective.

这一情况可使强力抗菌素失效，而强力抗菌素常常是针对耐多药菌株的最后一道防线。

youdao

Ruhli notes researchers used that technique to study the evolution of the tuberculosis bacteria from 2,000-year-old mummified tissue to modern-day strains.

VOA: standard.2010.05.05

As a result, the world is menaced by "superbugs" - strains of bacteria that defy all existing forms of treatment.

CNN: FIGHTING SUPERBUGS

They have now repeated the feat ten times, and thus have 11 strains of bacteria that each possess 21 amino acids.

ECONOMIST: Chemists are trying to synthesise new varieties of life

The researchers found that similar strains of bacteria were found within individual day care centres - but that different centres harboured different strains.

BBC: Nursery