triple auxotroph

例句：

1. 1. The triple mutant strainwas found to have a unique genetic mutationthat affects its growth and development.
   发现这种三重突变型菌株具有一种独特的遗传突变，影响其生长和发育。
2. 2. The triple mutant phenotype is characterized bythe presence of three different mutations in thesame gene.
   三重突变型表型特征是在同一基因中存在三种不同的突变。
3. 3. The triple mutant strain has been usedas a model organism for studying the effectsof environmental factors on plant growth and development.
   三重突变型菌株被用作研究环境因素对植物生长和发育影响的模型生物。