直到…才
An acceptance has no effect unless and until it is communicated to the offeror.
一个承诺只有通知到要约人时才发生效力。
Unless and until the Employer receives this guarantee, this Sub-Clause shall not apply.
除非并直到雇主收到此保函，本款应不适用。
Unless and until there are adequate demonstrations, it is possible this market panic will continue.
除非有足够充分的证明，否则市场的恐慌仍将继续。
The attraction of unfettered ******* and absolute rigor are limited, unless and until this can be achieved.
关于无限自由和绝对精确的吸引力是有限的，除非上述疑惑能被解开之后。
Unless and until additional U. S. sanctions are announced, it's hard to judge how much they will hurt Russia.
除非直到美国宣布新的制裁，否则很难判断俄罗斯的受创程度。
“unless and until”是一个固定搭配的连词短语，通常用于强调某种条件与时间上的双重限制。以下是详细解释：
条件+时间的双重约束
表示某件事只有在特定条件满足且持续到某个时间点后才会发生或生效。
例句：The contract is void unless and until both parties sign it.
（合同在双方签署之前且直到签署时才会生效。）
常见于正式文体
多用于法律文件、合同或正式协议中，以确保表述的严谨性，避免歧义。
例：Payment will not be processed unless and until the application is approved.
（申请获批前且直到获批时，款项才会处理。）
主句通常为否定形式
主句常用否定结构（如 will not, cannot），突出“条件未满足时结果不成立”。
例：You cannot access the system unless and until you reset your password.
例：We won’t start unless you arrive.（你不到达，我们不会开始。）
例：We’ll wait until you arrive.（我们会等到你到达。）
通过这种结构，可以精准表达“在满足条件前不行动，且行动仅在条件达成时生效”的逻辑。
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