4000 Duolingo Vocabulary List

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n. 無知 lack of knowledge or education

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v. 点灯 provide or brighten with light; clear up or make understandable; enlighten

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n. 事件 usually minor event or condition that is subordinate to another; event; happening

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a. 互換性 inharmonious; impossible to coexist; not easy to combine harmoniously

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n. 不信 disbelief; doubt about the truth of something

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a. 欠かせない essential; requisite;  impossible to be omitted or remitted

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n. 乳児は babyhood; the time when someone is a baby or a very young child

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a. 感染症 able to pass disease from one person, animal, or plant to another; contaminating

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v. 潜入 pass into or through; penetrate with hostile intent

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a. 革新 marked by or given to innovations; introducing a change