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  1. 知識+

    • 什麼是P's andQ's

      ... had learning to distinguish between the letters p and q, since they are mirror images of one another. We received...

    • 這句英文怎翻比較好 ?

      ...t0) ∈ U,則 x(t) ∈ U 對所有 t ≥ t0。bounded away from p and q  與 p, q 隔開就是 d(U,p) = inf{d(x,p): x ∈ U} > 0,d(...

    • 有關英文諺語的解釋^^

      2.mind one's Ps and Qs 注意言行(P是please, Q是thank you) one's Is and cross one...