unthread slack switch退: retreat; draw back; move bac ...带: belt; girdle; ribbon; band; ...松弛: limp; flabby; slack; loose开关: Q-switching进带松弛开关: fwd slack sw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:退带松弛开关，即可在微信中查询翻译
