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    时长:9.3分钟 · 播放:1510次
    来源:互联网 · 2017-10-18
    When a freak tornado hit her Massachusetts hometown, Caitria O’Neill wasn't an expert in disaster relief recovery. 
    时长:7.8分钟 · 播放:1496次
    来源:互联网 · 2017-10-18
    Michael McDaniel designed housing for disaster relief zones -- inexpensive, easy to transport, even beautiful – but found that no one was willing to build it. 
    时长:14.3分钟 · 播放:2748次
    来源:互联网 · 2017-11-09
    山林火灾频繁发生,我们该如何保护生态平衡?