词典释义：
a fundamental truth or proposition that serves as the foundation for a system of belief or behaviour or for a chain of reasoning
原理，原则
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the basic principles of Christianity .基督教基本教义。
(一般作
（个人行为）准则；规范
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struggling to be true to their own principles 为坚持他们自己的原则而奋斗
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[mass noun]
she resigned over a matter of principle .她因原则问题而辞职。
[mass noun]morally correct behaviour and attitudes
操守，道义；原则性；正直
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a man of principle .有原则的人。
a general scientific theorem or law that has numerous special applications across a wide field
原理；定理；基本原理。
a natural law forming the basis for the construction or working of a machine
（机器的）建构（或工作）原理
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these machines all operate on the same general principle .这些机器总的工作原理都一样。
a fundamental source or basis of something
起源，本原
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the first principle of all things was water .水是万物之本。
a fundamental quality or attribute determining the nature of something; an essence
本质，实质
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the combination of male and female principles .男性与女性本性的结合。
[with adj.]
【化】 成分，要素
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the active principle of Spanish fly .斑蝥制剂的活性成分。
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in principle as a general idea or plan, although the details are not yet established or clear 原则上the government agreed in principle to a peace plan that included a ceasefire . 政府原则上同意了一项包括停火在内的和平计划 -
used to indicate that although something is theoretically possible, in reality it may not actually happen 在理论上，据设想（实际上未必发生）
in principle, the banks are entitled to withdraw these loans when necessary . 理论上，银行在必要时有权收回这些贷款 -
on principle because of or in order to demonstrate one's adherence to a particular belief 根据行为准则，按照原则he refused, on principle, to pay the fine . 他依据原则拒绝支付罚款
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in principle 原则上；大体上
真题例句：
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the principle(s) of ... ...的原则
真题例句：
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key principle 主要原则
真题例句：
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basic principle 基本原理
真题例句：
"late Middle English： from Old French, from Latin
