三相四线桥式整流电路 three-phase four-wire-bridge rectifier circuit
四桥汽车无线电放大器 quad bridge car radio amplifier
四线铁路桥 Quadruple-track railway bridge
该研究思路和方法也为四线钢桁梁桥及更多线钢桁梁桥的疲劳检算多线系数研究提供依据。
The research ideas as well as (approaches) have provided useful reference of multiple-line coefficient for fatigue check and computation of four-line and multiple-line steel truss bridge.
我看了天下第一桥，一线天，四步云梯……真是令人赏心悦目。
I saw the world bridge, thin strip of sky, the four-step ladder … is really very enjoyable.
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