英単語＋例文
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optimist (楽観主義者): She is an optimist a…
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optimistic (楽観的な): I’m optimisti…
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option (選択肢): You have several options…
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optional (任意の): The exam is optional f…
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operate (操作する): She knows how to opera…
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or (または): Would you like coffee or tea…
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operation (手術): He had an operation on…
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or so (おおよそ): I’ll be back in an…
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one hundred (100): I have one hundred …
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One is ～, the other is … (一つは～、もう一つは…)…