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原理的英文：
principle
theory

參考例句：
We owe to Newton the principle of gravitation.
我們全靠牛頓才知道引力原理。The uncertainty principle can account for diffraction
測不準原理可以說明衍射。Archimedes first discovered the principle of displacement of water by solid bodies.
阿基米德最先發現固體排水的原理The proclamation of religious truths,especially as taught in the Gospels.
基督福音的布道對宗教原理的宣講，尤指講福音書中的原理A display device in which display images are generated on a display space by raster graphics
一種顯示裝置按光柵圖形原理在其顯示空間內產生顯示圖象。Compasses may operate on magnetic or gyroscopic principles or by determining the direction of the Sun or a star.
羅盤可利用地磁場或陀螺儀原理，亦可依靠測定太陽或星體方位來指示方向。The principle of cyclic sedimentation applies to deposits dating from earliest Paleozoic time to the Holocene
旋回沉積原理適用于始于最早的古生代迄至全新世的沉積物。The principle of jet propulsion.
噴氣推進的原理element of mechanics of plasticity
塑性變形的力學原理The equipartition principle is a part of classical physics.
均分原理是經典物理學的一部分。

principle是什么意思：
n. 原則，原理；起源；主義；道義
principle of discrimination
區別原則[指戰時區別軍事/非軍事目標] Adhesion to the principle of independence and abstract is infraction of the principle of honesty.
固守獨立抽象原則是有悖于誠實信用原則的。He was a man of the highest principles.
他是個道德崇高的人。To instruct in a body of doctrine or principles.
傳授以教條或信條的方式來教授、教導 The principle or law that orders the universe.
（佛教的）法約束天地萬物的規則或法律

theory是什么意思：
n. 原理，理論，學說；觀點，推測
configuration theory
完形說 Marxist theory will advance and so will socialist theory.
馬克思主義要發展，社會主義理論要發展Develop a new theory by the synthesis of several earlier theories
綜合以前的幾種學說而創立的新學說.The Implicit Cognition Theory is related to the tacit knowledge theory.
內隱認知理論是與緘默知識理論相聯系的。Our theory countered his.
我們的觀點和他的相反。