bèi yòng xiàn lù
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Chinese dictionary
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  • n.spare circuit; spare line

    • suǒ yǒu bèi yòng xiàn lù yīng jiā biāo qiān huò qīng xī biāo zhù

      所有备用线路标签清晰标注

      All spare wires shall be tagged or otherwise clearly marked.