Spoken in 4 clips from one channel · B1–C1 · other forms: propagates, propagating
01 / 4Practical Engineering≈ approximate level B12:47–2:55 , .
02 / 4Practical Engineering≈ approximate level B13:55–4:01
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03 / 4Practical Engineering≈ approximate level B15:18–5:23
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04 / 4Practical Engineering≈ approximate level C12:43–2:54
, , , .
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4 clips · one channel Also heard in these clips