这一数字可能并不令人惊讶；毕竟，我们经常在媒体上看到笼罩北京、上海和中国其他城市的浓重烟雾的影像。
That figure may not come as a surprise; after all, we are routinely treated to images in the media of thick, sooty smog enveloping Beijing, Shanghai, and other Chinese cities.