symmetric stretch对称: symmetry; symmetrical管: pipe; tube伸缩: stretch out and draw back; e ...套管伸缩轴: extension shaft对称管制: symmetrical administration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:对称管伸缩,即可在微信中查询翻译