因此如果你有双重系统并且合理设计的话，就没必要使用杀虫剂对付那些害虫了。
So if you have a mixed system, and design it very carefully, you don't need to use any pesticides to kill the pests.
其中的原因，研究人员说是因为我们有双重的视觉系统。
The reason, the researchers say, is that we have a dual vision system.
要通过“双重认证系统”，不仅需要你提供你所知道的信息，而且还需要你携带的东西（比如某种电子信物），或者你身体的某部分（以生物识别形式）。
Two-factor systems rely not just on something you know, however, but also on something you have, such as an electronic token, or something you are, in the form of a biometric.
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