rigid crossing frog固定式: stationary type; permanent交叉: cross connection; intersect; ...辙叉: frog交叉辙叉: cross-frogs固定式交换机: floor type switchboard下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:固定式交叉辙叉，即可在微信中查询翻译
