Share: Title:A stay is a few months! How do submarines supply oxygen underwater? Engineers have their own tricks Duration: 2:56 Plays: 408 views Published: 3 months ago Download MP3 Download MP4 Simillar Videos ▶️ 3:03 耗资300亿美元建成的日本关西机场，预计50年后沉没，能避免吗？ 408 views • 19 hours ago ▶️ 2:50 一座被收费站给包围了的城市，你知道是哪吗？简直是规划鬼才！ 408 views • 8 days ago ▶️ 1:01 动画片是怎么制作的 #原创动画 #科普知识 #轻漫计划 #动画片 408 views • 2 weeks ago
