Arcis阿尔西arcn.弧；弧形物vi.形成电弧；按弧形轨迹行进arc-hyperbolic cosine反双曲余弦arc extinguishing board灭弧板arc-welding electrode电弧焊用焊条arcto-tertiary forest北极第三纪森林Arctogalidia trivirgatan.小齿狸arc-hyperbolic secant反双曲正割arc section of web slab腹板弧形段arctocebus calabarensisarc-shaped brick wall弧形砖墙arc tangent curve model反正切曲线模型