我认为使用unless加else条件句就好像在讲双重否定。
I think using unless with else is like speaking with double negatives.
要模拟if - else场景中的else部分，请否定原始条件即可。
To simulate the else portion of an if-else scenario, negate the original condition.
通过证明延迟是由于保险人在签订保险合同之前已知道的情况造成的，或证明保险人已放弃该默示条件，该默示条件可以被否定。
The implied condition any be negative by showing that the delay was caused by circumstances known to the insurer before the contract was concluded, or by showing that he waived the condition.
对抗条件反射作用：意在用肯定反应代替对某刺激产生的否定反应的条件反射作用。
Counterconditioning: conditioning intended to replace a negative response to a stimulus with a positive response.
Need的助动词形式主要用于现在时态的疑问句、否定句和条件句中。
The auxiliary forms of need are used primarily in present-tense questions, negations, and conditional clauses.
研究人员已经对一些自称拥有灵力的人进行了测试，但是迄今为止，他们在受控实验室条件下得到的都还是否定或含糊的结果。
Researchers have tested people who claim to have psychic powers, though the results under controlled scientific conditions have so far been negative or ambiguous.
可以使用半否定、条件句、否定转移、省略、疑问句、婉转暗示和迂回等手段。
The fourth device is by syntax such as partial negation, conditional sentence, transferred negation, ellipsis, interrogative sentences, tactful implication and periphrases.
对于一人有限责任公司，世界各国和地区在立法中基本上都经历了从否定到有条件肯定、从有条件肯定到完全承认的过程。
One-person Limited Liability Companies, go through a proceeding of absolute denial, conditional approval, and full approval in most of countries and regions' company laws.
外部否定主要包括对句子情态的否定和对命题的合适性条件的否定，后者又称元语言否定或语用否定。
External negation mainly includes the negation of modality and felicity condition of the sentences. The latter is also named meta-linguistic negation or pragmatic negation.
外力的存在是实现否定的必要条件，是辩证否定的基本形式之一。
The outside force which is the necessary condition and one of the basic forms of dialectical negation plays a decisive role in the direction and nature of the development of things.
实现对否定句的实际状态模拟是受到语用条件的限制的，否定并不是对否定辖域命题内容的反向推理。
The achievement of simulation of actual state of affair was constrained by the pragmatic factors. Negation was not the opposite inference of the propositional contents within the negation scope.
研究人员已经对一些自称拥有灵力的人进行了测试，但是迄今为止，他们在受控实验室条件下得到的都还是否定或含糊的结果。
Researchers have tested people who claim to have psychic powers though the results under controlled scientific conditions have so far been negative or ambiguous.
研究人员已经对一些自称拥有灵力的人进行了测试，但是迄今为止，他们在受控实验室条件下得到的都还是否定或含糊的结果。
Researchers have tested people who claim to have psychic powers though the results under controlled scientific conditions have so far been negative or ambiguous.
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