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.
双重密钥安全认证是用于验证跨不同系统访问的保护方法之一。
Double key secure authentication is one of the protection methods used to verify access across different systems.
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