筛选标记主要有营养缺陷型、药物抗性标记；

Two main select markers were auxotroph and drug resistance.

youdao

从大肠杆菌中也分离出若干种不同的营养缺陷型。

Tatum isolated a number of different auxotrophs of E. coli. Tatum.

youdao

最好听从这样的建议，长期坚持服用复合维生素能填补营养缺陷，帮助消费者更健康的生活。

It is better to meet these recommendations than not, and consistently taking a multivitamin over the long term could help fill these nutrient gaps and may help consumers lead healthier lives.

youdao