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Much of the waste is discarded rotten meat, mixed in with other human debris such as plastic bags and old toys.
出自-2017年6月阅读原文
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Usually when we walk through the rain forest we hear a soft sound from all the moist leaves and organic debris on the forest floor," says ecologist Daniel Nepstad.
出自-2013年6月阅读原文
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dead leaves and tree debris make the same sound
出自-2013年6月阅读原文
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organic debris echoes the sounds in a rain forest
出自-2013年6月阅读原文
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Agencies and companies throughout the world are working on developing technology that would dispose of or capture space debris before it causes serious damages.
2019年6月六级真题（第二套）阅读 Section C
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In 2009 an old Russian craft slammed into a communications satellite, creating a cloud of hundreds of pieces of debris and putting other hardware at risk.
2019年6月六级真题（第二套）阅读 Section C
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It includes accounting for any piece of debris they plan to release over 5mm that might stay in orbit for 25 years or more.
2019年6月六级真题（第二套）阅读 Section C
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Journalist Sarah Scoles reports that NASA currently tracks about 24,000 objects in space, and in 2016 the air Force had to issue 3,995,874 warnings to satellite owners alerting them to a potential nearby threat from another satellite or bit of debris.
2019年6月六级真题（第二套）阅读 Section C
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Space Policy Directive-3 lays out general guidelines for the United States to mitigate the effects of space debris and track and manage traffic in space.
2019年6月六级真题（第二套）阅读 Section C