automatic slow-down test自动: voluntarily; of one's own ac ...降速: reduction of speed试验: experiment; test; trial自动降速装置: automatic slow down device桥楼自动降速报警: bridge auto slow-down alarm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:自动降速试验，即可在微信中查询翻译
