notation

US /noˈteʃən/

UK /nəʊ'teɪʃn/

C2 高級英檢高級
n.名詞音符;數學符號
Your math notation is very clear; I can read it easily

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黑暗時代有多黑暗? (How Dark Were the Dark Ages?)

05:38黑暗時代有多黑暗? (How Dark Were the Dark Ages?)