By the same techniques used for genetically enhancing plants,making them disease- or pest-resistant ,researchers have been able to increase the amount of protein in potatoes,sweet potatoes, and tobacoo.
With the same techniques to genetically enhance plants,so that they are disease- or pest-resistant ,researchers have been able to increase the amount of protein in potatoes,sweet potatoes, and tobacoo.
Employing the same techniques used for genetically enhance plants so that they are disease- or pest-resistant ,researchers have been able to increase the amount of protein in potatoes,sweet potatoes, and tobacoo.
这三句话中粗体的they 或them在语法上分别指代什么啊?提醒:前面两句是有逻辑错误的。
谢谢! |