4000 Duolingo Vocabulary List

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n. 习语,成语 an expression whose meaning differs from meanings of its individual words; distinctive style

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n. 无知,不了解 lack of knowledge or education

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v. 照亮,明朗,澄清 provide or brighten with light; clear up or make understandable; enlighten

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n. 怀疑,不相信 disbelief; doubt about the truth of something

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a. 锯齿状的,高低不平的 cut in the edge into points or inequalities, like teeth; having an uneven, irregular border

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v. 通知,告诉,(向警方)告发 impart information to; make aware of something; be a pervasive presence in; animate

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v. 注射,注入,灌溉 put in; infuse; force or drive fluid into something

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a. 不足的,不够的 of a quantity not able to fulfill a need or requirement

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a. 不可战胜的,不能克服的 impossible to overcome; unbeatable

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v. 保险 make sure or secure, specifically against loss by a contingent event; give or take insurance on