雾 (wù) 是一种天气现象，可以用英语表示为 "fog"。雾是由水汽凝结成的，当空气中的水汽在低温下凝结成水滴时，会形成雾。雾通常出现在冬季或者温度较低的地区。
雾是可以数的名词，所以可以用 "a fog" 或 "fogs" 来表示。例如：
"The city was blanketed in a thick fog this morning, making it hard to see the road ahead." (这个城市今天早上被浓雾笼罩，很难看到前面的路。)
"The fog was so dense that I couldn't see more than a few feet in front of me." (雾很浓，我前面只能看到几英尺远。)
在英语中，雾也可以用形容词 "foggy" 来表示，例如：
"It was a foggy morning, so I had to use my headpghts to see the road." (天气有雾，所以我必须开着车灯看路。)
"The foggy weather made it difficult to see the landmarks on the way to the airport." (雾天使得我们很难看到前往机场的地标。)
雾是可以数的名词，所以可以用 "a fog" 或 "fogs" 来表示。例如：
"The city was blanketed in a thick fog this morning, making it hard to see the road ahead." (这个城市今天早上被浓雾笼罩，很难看到前面的路。)
"The fog was so dense that I couldn't see more than a few feet in front of me." (雾很浓，我前面只能看到几英尺远。)
在英语中，雾也可以用形容词 "foggy" 来表示，例如：
"It was a foggy morning, so I had to use my headpghts to see the road." (天气有雾，所以我必须开着车灯看路。)
"The foggy weather made it difficult to see the landmarks on the way to the airport." (雾天使得我们很难看到前往机场的地标。)