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  • “radian”的英英意思

    “radian”的英英意思

    单词 radian 释义 radian Trig.|redn|[f. radi-us + -an.](See quot. 1879.)1879Thomson & Tait Nat. Phil. I. i. 41 The usual unit angle is..that which subtends at the centre of a circle an arc whose length is equal to the radius;..for brevity we shall call th...

    2025-07-28