单词：radar fence
radar fence的用法和样例：
例句
- There is a radar net in our area.在我们那个地区有一个雷达网。
- Although the capability of earlier track initiation within netted radar systems is often referred to in many articles, no one has proved it theoretically.很多文章均指出雷达网系统具有航迹快速起始的性能，但是尚没有资料从理论上对此加以证明。
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