- electric center
- 电: electricity
- 中点: center mark; center point; centre mark; centre middle; centre point; centre spot; focus; median point; mid point; mid position; mid-position; middle point; neutral point
- 组中点；区中点: cla mid-point（cla mark）; class mid-point (class mark); class mid-point （class mark）
- 组中点；组中点: cla mark（cla mid-point）; class mark (class mid-point); class mark （class mid-point）
- 电中和: electrical neutralization
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