英単語＋例文
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observe (観察する): I observed the birds i…
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occur (起こる): The accident occurred yes…
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obsessed (取りつかれる): He is obsessed with…
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occurrence (発生): The occurrence of nat…
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obsession (強迫観念): Her obsession with c…
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ocean (海洋): The ocean covers most of t…
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obsolete (時代遅れの): The old technology h…
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obstacle (障害): The biggest obstacle to…
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obese (肥満した): Obesity is a growing hea…
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obesity (肥満): Obesity can lead to vari…