In order to obtain transgenic plants with high yields, high quality and multiple resistant characters, the transformations of three or more genes into poplar were needed and manipulate multiple genes.
为了达到培育高产、优质、多抗等性状的品种目的，需要把三个或更多有用基因导入杨树中，进行多基因操纵。
参考来源 - 基因枪转多基因杨树的获得·2,447,543篇论文数据，部分数据来源于NoteExpress
Even more alarming, well over half of these cases were resistant to multiple drugs right from the start, and not as a direct result of substandard treatment.
甚至更令人震惊的是，这些病例有一半以上一开始即具有耐多药性，并不是因不规范治疗而造成的直接结果。
So is the fact that the well was not fitted with multiple pressure resistant casings, a decision which may have been key to the initial blowout.
同样，实际上，油井并没有安装能抵制多重压力的匣子，这一决定可能成为最初爆裂的主要原因。
Once ovarian cancer becomes resistant to multiple types of chemotherapy, fewer treatment options exist and the focus becomes lengthening patients' survival periods.
一旦卵巢癌对多种化疗药物产生耐药，则治疗的选择余地较少，而随后治疗的关键在于延长患者的生存期。
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