赖世雄英语新闻听力通 第57期:汽车废气会引发心脏病

 (WASHINGTON, Reuters)Research shows that two hours of exposure to elevated levels of car emissions¹ raises the likelihood of a heart attack.

（路透社华盛顿电）研究显示，接触高浓度汽车排废气达两个小时时，会提高心脏病发作的可能性。

The risk of a heart attack increases 48 percent in the two hours after exposure and there is an increased risk even 24 hours after exposure.

接触废气两个小时之后，心脏病发作的危险性增加了4800，甚至经过廿四个小时之后也仍有增加心脏病发作的危险。

People should avoid going outside for a long period of time when air duality is poor.

空气质量差的时候，民众应该避免长时间外出。

1 emissions   

排放物( emission的名词复数 )； 散发物（尤指气体）

参考例句：

• Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
• Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。