Learner's definition of LOGIC
1
a : a proper or reasonable way of thinking about or understanding something（合乎情理的）思维方式，认识方式；逻辑 [noncount]
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If you just use a little logic, you'll see I'm right.你稍稍用点逻辑，就会明白我是对的。
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the rules of logic逻辑规则
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There's no logic in/to your reasoning.你的推理不符合逻辑。
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I can't see the logic in always worrying about the future. = Where's the logic in always worrying about the future?我不明白总是担心未来有什么道理。
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There's some logic to/in what he says.他的话有点道理。
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She kept the dog, against all logic, after it attacked her. [=her decision to keep the dog was not logical/sensible]被那只狗攻击之后，她居然还收养了它，真是不合常理。
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Her decision defies logic. [=her decision makes no sense; her decision is not logical]她的决定不合逻辑。
[singular]
b [noncount] : a particular way of thinking about something思维方式；推理法；理由 -
I could not understand her logic in keeping the dog. [=I could not understand her reason for keeping the dog]我无法理解她收养那只狗的理由。
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I fail to see your logic. = I fail to see the logic behind/of your reasoning.我不明白你的推理方法。
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faulty logic错误的推理方法
2
[noncount] : the science that studies the formal processes used in thinking and reasoning逻辑学 — see also fuzzy logic 3
[noncount] : the way facts or events follow or relate to each other（事实或事件的）规律，相互联系 4
[noncount] technical : the arrangement of circuits in a computer（电脑）电路排列，电路逻辑