ditrigonal axis复: repeated; double; duplicate三次: triple; ter-; tri-轴: axle; shaft三次轴: three fold axis; threefold axis; triad axis重复三次: triplicate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:复三次轴，即可在微信中查询翻译
