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  3. [audioFiles]2016m8x/audio_ezfj_ezflisteningd_201607_178[/audioFiles] Trackin

[audioFiles]2016m8x/audio_ezfj_ezflisteningd_201607_178[/audioFiles] Trackin

游客2024-09-18  43
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答案     Tracking Toxic Chemicals
    The fireproof chemicals used in furniture and clothing / can become toxic pollutants when winding up in the environment. / As they are in the environment all over the world, / tracking the spread of them has been a major challenge. /
    But it got easier since a new technique has been developed / to measure the presence and concentration of these chemicals in the air by sampling tree bark. / A tree’s bark provides a large surface area that takes in chemicals. / Also, because a layer of bark remains on the tree for years before being shed, / it provides a unique record of the environment over time. /
    This approach has many advantages over the current sampling method, / which involves pumping air through expensive equipment / and requires plenty of manpower and electricity. / It can be used in developing countries / which don’t have a lot of funding for elaborate atmospheric studies. / Also we can use this method in remote sites where there is no power. /
解析     追踪有毒化学物质
   家具和衣物中的防火化学物质落人环境后可能成为有毒污染物。追踪它们的扩散就成为一个难题。自从一项新技术开发出来以后，这个任务就变得较为容易了。该技术通过对树皮进行抽样检验来测量这些化学物质是否存在以及达到什么浓度。另外，由于树皮在脱落前会留在树上很多年，它记录着一段时间内的环境变化。
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