Spoken in 3 clips from 3 channels · B2–C1 · other forms: pioneered, pioneering, pioneers
01 / 3PBS NewsHour≈ approximate level C10:01–0:09 , 's , .
02 / 3TED≈ approximate level B21:30–1:42
, .
03 / 3The School of Life≈ approximate level C11:29–1:38
’s , , .
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3 clips · 3 channels