contact line

例句：

1. 1.The engineer carefully measured the length of the contact line before installing the new cable.
   工程师在安装新电缆之前仔细测量了接触线的长度。
2. 2. The scientists used a laser to create a precise contact line for their experiment.
   科学家们使用激光创建了一个精确的接触线，用于他们的实验。
3. 3. The contact line between the two countries has been strained due to trade disputes.
   由于贸易争端，两国之间的接触线已经紧张。