only if;only when;

They can't destroy truth without destroying each and every one of us.
除非他们将我们赶尽杀绝,否则真理不灭。
来源:《柯林斯高阶英汉双解学习词典》The targets would not be achieved unless other departments showed equal commitment.
除非其他部门同样努力,否则这些目标无法达成。
来源:《柯林斯高阶英汉双解学习词典》The dug-outs were secure from everything but a direct hit.
除非是直接被击中,否则这个地下掩体是非常安全的。
来源:《柯林斯高阶英汉双解学习词典》Unless these questions are solved, the region will remain a powder keg.
除非这些问题得到解决,否则该地区会一直是个火药桶。
来源:《柯林斯高阶英汉双解学习词典》The South African mailboat arrived on Friday mornings unless bad weather intervened.
除非受恶劣天气干扰,南非邮船一般在星期五上午抵达。
来源:《柯林斯高阶英汉双解学习词典》All bitches should be spayed unless being used for breeding.
除非是用作种犬,所有的母犬都应摘除卵巢。
来源:《柯林斯高阶英汉双解学习词典》She refused to testify, unless the murder charge against her was dropped.
除非撤销对她的谋杀指控,否则她拒绝作证。
来源:《柯林斯高阶英汉双解学习词典》
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