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(1)原理(則) (basic truth that underlies sth) [C][N(of)]： the～s of geometry/navigation/political economy/psychology/cooking/Christianity 幾何學(xué)/航海學(xué)/政治經(jīng)濟(jì)學(xué)/心理學(xué)/烹調(diào)/基督教原理;the～of freedom of speech/equality of opportunity for all 言論自由/機(jī)會(huì)均等的原則;the～of Archimedes 阿基米德定律;the first～s 基本原理;〖同〗rule，truth，law;

(2)行為的準(zhǔn)則(規(guī)范) (general rule or standard of (usu good) behaviour) [C， 通常pl; U][N(of)]： live up to/according to one's～s 按自己的行為準(zhǔn)則行事;abandon one's～s 放棄自己的行為準(zhǔn)則;～s of conduct 行為準(zhǔn)則;moral～s 道德準(zhǔn)則;a man of high～(s) 有高度道德原則的人;He seems to have no～s at all when it is a question of making money. 遇到賺錢的問(wèn)題時(shí)，他好像一點(diǎn)都不講道德。They are quite without～. 他們很不講道德。It's against her～s to lie. 說(shuō)謊違背了她的行為準(zhǔn)則。It is a matter of～with sb to do... 做……對(duì)某人來(lái)說(shuō)關(guān)系到做人的大問(wèn)題。

(3)(機(jī)器等的)工作原理 (theory by which a machine， etc works) [C， 通常 sing][N(of)]： the～of the jet engine/acceleration 噴氣發(fā)動(dòng)機(jī)/加速度原理;These machines work/A bicycle and a motorcycle are built on the same～. 這些機(jī)器工作原理相同/自行車和摩托車的制造原理相同。

in principle 1)從理論上講，按道理： We expect it to work in～but we've yet to try. 按道理講我們認(rèn)為它能工作，但我們還得試一試。2)原則上，大體上，基本上： I agree with you in～but I'd like to discuss a few details. 我原則上同意你的意見(jiàn)，但是我想討論幾個(gè)細(xì)節(jié)問(wèn)題。

on principle 由(出)于自己的道德觀念或信仰： We disagree with all violence on～. 從道德觀念上講，我們不贊成任何暴力。

→′principled adj 原則(性)的，有原則(性)的