1. In microwave system the separate input from various sources must be brought together to give a composite input which is then transmitted and received by radio. 
   在微波系统中，来自各处的分散的输入必须被汇集在一起，以形成一个综合的输入，然后由无线电发送和接收。
2. The next level of externalization holds more powerful and promising search tools and document management systems that classify the stored knowledge and identify similarities among separate information sources. 
   下个层次的外部化包含更强大、更有希望的搜索工具和文档管理系统，它们对存储的信息进行分类，并在不同的信息源中找出相似点。
3. control of pollution sources 
   污染源控制
4. extragalactic compact radio sources 
   河外致密射电源
5. extragalactic extended radio sources 
   河外射电展源

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