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

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

dead leaves and tree debris make the same sound

出自-2013年6月阅读原文

organic debris echoes the sounds in a rain forest

出自-2013年6月阅读原文

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

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

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

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

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