- principal rseries
- principal series
- 系 system; series
- 主线 cardinal line; main toll route; mainline; masterstroke; mean line; principal line
- 线系 lineal series; linellae
- 干线, 主线 main line
- 干线;主线 main line
- 公主线 princess line; princess seam; princessseam
- 主线, 干线 main track
- 主线材 basic wire
- 主线程 main thread
- 主线船 minni land bridge mother vessel; mother vessel
- 主线串 primary string
- 主线段 major section
- 主线圈 main coil; main winding; principal winding
- 主线束 principal wire bundle
- 主线通道, 主线信道 main line channel
- 侧中主线 ear to ear parting
- 地址主线 address main line
- 第一主线串 first primary string
- 电话主线 mtl main telephone line; telephone trunk line
- 公主线缝骨 princess seam
- 环形主线 ring main
- 区划主线 main compartment-line; major ride; management stripe
- 正中主线 mohican section
- 指令主线 instruction main line
- 主线程序 main line program; mainline program
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