俗话说“条条大路通罗马”，背诵
【新词】
最近“雾霾”这个话题又重新火了，我们的生存环境正在面临极大的考验!!
fog and haze
n.The combination of "fog"and "haze". It mainly contains sulfur dioxide , nitrogen oxides and particulate matter.名词.是“雾”和“霾”的合成词。它主要由二氧化硫、氮氧化物和可吸入颗粒物组成。
fog n.雾
Smoke began to spread across the freeway like fog. 烟开始像浓雾一样在高速公路上蔓延。
haze n.霾
But then you peer into the Chinese haze - and despair.但当你凝视中国的阴霾，你就会感到绝望。
【科普速递】
PM 2.5 refers to particles less than 2.5 micrometers in diameter, which can enter the lungs and bloodstream. PM2.5是指直径小于2.5微米的颗粒物，它可以进入肺部及血液。
Small particles in the air can cause heart disease, stroke, respiratory illness, birth defects and cancer.空气中的小颗粒物会引起心脏疾病，中风，呼吸系统疾病，先天畸形和癌症。