Spoken in 4 clips from 3 channels · B2–C1 · other forms: pillars
01 / 4CrashCourse≈ approximate level C19:05–9:09 , .
02 / 4CrashCourse≈ approximate level C19:39–9:43
.
03 / 4TED≈ approximate level B25:04–5:07
.
04 / 4Practical Engineering≈ approximate level C10:00–0:08
.
Keep “pillar” until you know it
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4 clips · 3 channels