unless and until

基本解释

Dubbed Pay-What-You-Can, the training is a free gift, unless and until you decide to pay for it.
除非你願意付錢，在你付款之前，培訓都是免費的禮物，這被稱作“付你能付”。
Unless and until this is done other policies, no matter how apparently appealing or effective in normal times, will be futile at best.
如果做不到這一點，其它政策最多也衹能算是徒勞無功——無論它們在平時看起來多麽吸引人或有傚。
U.S. and Israeli officials say they will have nothing to do with Hamas unless and until the group renounces violence and agrees to recognize Israel.
美國和以色列的官員說，除非哈馬斯放棄暴力竝且同意承認以色列，否則他們不會同哈馬斯組織打交道。

"For sure the military will not only clear and secure the area, but ensure unless and until the area is taken over completely by the civil administration, and the writ of the government is restored and peace and normalcy return to the area, the military will remain in the area,".

We won't know unless and until somebody talks about what the actual secret is.
NPR: Invoking the State Secrets Privilege
Unless and until the Krasnoyarsk radar is destroyed, for example, all deals should be off.
CENTERFORSECURITYPOLICY: At What Price Arms Control Agreements?
Sprint does not intend to comment further unless and until an agreement is reached.
FORBES: Softbank Must See The Value in Clearwire's 2.5 Ghz Spectrum