The technology to direct synthesis of these agents, such as Bt, to specific tissues is known and under development but not yet perfected.
人们已经了解并开发命令这些介质(比如蓝四氮唑)合成特定组织的技术，但并不完善。
Bt is a favored organic pesticide because its toxicity is very specific, making it harmless to just about everything but the pest in question.
Bt由于它的毒性非常专一，只是对昆虫有毒性而受有机农药欢迎。
But as the conclusion: When I ring BT, do you see what I mean?
但是结论是，当我给BT打电话，你们明白我的意思吗？
Insect resistance to Bt would do irreparable harm, not just to genetically modified crops, but to organic crops as well, because Bt sprays would be rendered useless.
而Bt抗性也会产生不可取代的危害，不仅是对于基因改良作物，还有那些需要用Bt喷雾来抗虫的作物。
BT has no plans to build a national mobile network, but intends to enhance its existing broadband and Wi-Fi services.
BT公司则并不打算建造覆盖全英的移动通讯网，不过它计划加强现有的宽带和无线网络服务。
Bt every turn on the phone for a more trend, but a friend, it is a lifetime thing, I wish a happy National Day!
手机可以动不动就换一款更潮流的，但朋友，那是一辈子的事情，祝国庆快乐！
But there are significant variations of Bt resistance frequency in between the two sites.
的抗性个体频率仍然处于较低水平，但两个地区之间存在明显的差异。
But there are some problems that threaten the use of Bt, of which the most serious one is that some species have become resistant to it.
但也存在一些问题严重威胁了它的应用，其中以害虫产生抗性为最重要。
But there are some problems that threaten the use of Bt, of which the most serious one is that some species have become resistant to it.
但也存在一些问题严重威胁了它的应用，其中以害虫产生抗性为最重要。
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