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1. The principles of microstrip balun and printed dipole were analyzed, and the antenna's ground plane was extended and shaped to form the reflecting structure.
   分析微带巴伦和印制偶极子的工作原理，延伸并成形天线的地平面以得到反射结构。
2. The base line can be set out as a single or double chain.
   基线可作为一条单链系或双链系。
3. Dr Beavan has started projects to develop long-base line tiltmeters with earthquake prediction in mind.
   比花恩博士考虑到地震预报，开始发展长基线倾斜仪。