non-orientable不能: cannot; must not; should not ...定向: directional; orient; orienta ...的: 4次方是 The fourth power of 2 i ...定向的: directed; directional; directive; leading; oriented; orienting; targeted方向的定向的: directioal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:不能定向的，即可在微信中查询翻译
