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language proficiency
言語能力
言語熟達度、運用能力
EF English Proficiency Index
fluency
vocabulary
The set of words in a given language that a speaker is familiar with, which can be subdivided into: a) words which are recognized upon hearing or reading; and b) words which a person feels comfortable using in speech.


googlelanguage proficiency
Google画像検索language proficiency
Google定義検索 language proficiency
wikipedialanguage proficiency
weblio language proficiency
kotobank language proficiency
jisho language proficiency