overhead line的用法和樣例：
例句
- Combinations of both overhead and under-ground HVDC line segments frequently occur.
高壓直流架空線(xiàn)路和地下線(xiàn)路分段的組合也常采用。 - It is difficult to obtain the dynamic models of converters, overlong overhead HVDC lines and passive filters in audio frequency.
然而，由于運行工況及氣候的影響，難以求取換流器及長(cháng)距離高壓架空線(xiàn)路在音頻帶內的動(dòng)態(tài)數學(xué)模型。
