upsrs unidirectional path switched rings中文什么意思

单项路径切换环

• unidirectional:    adj. 单向的。
• path:    n. (pl. paths ) 1. ...
• switch:    n. 1.(树上折下的)细树枝；软鞭 ...
• ring:    vt. (rang rung ) 1 ...