芯线xīn xiàn
centre yarn; core wire; component wire; filling thread
原声例句
大商业时代
There were no separate telephone wires.
没有单独的电话线。
雅思阅读真题
The telegraph, advice first proposed in 1753 and first built in 1774, was an impractical machine up until that point, requiring 26 separate wires, one for each letter of the alphabet.