单词：overhead line
overhead line的用法和样例：
例句
- Combinations of both overhead and under-ground HVDC line segments frequently occur.高压直流架空线路和地下线路分段的组合也常采用。
- It is difficult to obtain the dynamic models of converters, overlong overhead HVDC lines and passive filters in audio frequency.然而，由于运行工况及气候的影响，难以求取换流器及长距离高压架空线路在音频带内的动态数学模型。
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