荷兰为什么没有被淹没？- Stefan Al
Why it's on BrighterTube
From a channel a BrighterTube curator approved in full · found via Round 4 discovery (unsure list, re-vetted by transcript) · 85% confidenceFrom a channel Lumen includes in full after transcript vetting: TED-Ed's official channel; transcripts show genuine educator-authored lessons on science topics.
What you'll learn
A 5-minute video from 永葆探索热情 — TED-Ed's catalogue; the title names its topic.
Video by 永葆探索热情 — TED-Ed, played through YouTube's embedded player.