{"type":"rich","version":"1.0","title":"第四章 光","provider_name":"Coggle","provider_url":"https://coggle.it","thumbnail_url":"https://static.coggle.it/diagram/W07ts6_5PbN_4Y3F/thumbnail","width":1920,"height":1200,"html":"<iframe width=\"1920\" height=\"1200\" src=\"https://embed.coggle.it/diagram/5b4eedb3aff93db37fe18dc5\" frameborder=\"0\" allowfullscreen></iframe>"}