octagon / ˈɒktəɡən / n. 八角形

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Can you teach me to draw an octagon?

你可以教我画出八角形吗？

octopus / ˈɒktəpəs/ n. 章鱼

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I like eating octopus very much.

我很喜欢吃章鱼。

octuplets n. 八胞胎

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She has just given birth to octuplets.

她刚刚生了八胞胎。