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What "I picked up" means in this context?

Alan
6ヶ月前
In the sentence: I picked up my english from YouTube and movies, what does I picked up means? I don't think it means that there was english words on the ground..
picked up

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Profile PictureJackieFlag英語6時間前
コメント: 3詳細レポート
jackie
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speaking
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Alan 
英語
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4:57 PM (GMT-03:00)
登録日: 2017年5月18日