Contact mark. Intermittent marks adjacent to the weld line resulting from the electrical contact between the electrodes supplying the welding current and the pipe surface.

触点痕。由于供焊接电流的电极与管子表面间的电接触，致使在焊缝线附近产生不连续痕迹。

When negotiating with the Japanese, I have learned to use intermittent eye contact across the bargaining table rather than staring directly.

当和日本人谈判时，我学会了在谈判桌上不时地与对手进行目光交流，而不是一直盯着对方。