線 【セン】 line, stripe, stria, line (e.g. telephone line), wire, ray
(e.g. X-ray), beam, line (e.g. of a railroad), track, route, lane,
outline, contours, form, level, division, line (of action),
position, approach, policy, principle, impression one leaves, air
one gives off
横線 【オウセン】 horizontal line
赤外線 【セキガイセン】 infrared rays, infrared radiation