承诺的信息速率（永久虚拟电路的）的英文

cir committed information rate

• 承诺:    promise to underta ...
• 的:    4次方是 The fourth po ...
• 信息:    information; messa ...
• 速率:    speed; rate; tempo
• 永久:    permanent; perpetu ...
• 虚拟:    invented; fictitio ...
• 电路:    circuit; electric ...