emanation security

例句：

1. 1. The light emanated from the source.
   光线从源头发出。
2. 2.Emissions of carbon dioxide are a major concern for the environment.
   二氧化碳的排放是环境的主要问题。
3. 3. The scientist emitted a series of signals to communicate with his team.
   科学家向团队发射了一系列信号进行通信。