乌云
wū yún
black cloud
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云头很白。
yún tóu hěn bái。
The cloud head is very white.
降低污染
jiàng dī wū rǎn
Reduce pollution
云彩在天空中飘荡。
yún cai zài tiān kōng zhòng piāo dàng。
Clouds float in the sky.
我们爬上屋顶。
wǒ men pá shàng wū dǐng。
We climbed onto the roof.
我想减少污染
wǒ xiǎng jiǎn shǎo wū rǎn
I want to reduce pollution.
减少污染很重要
jiǎn shǎo wū rǎn hěn zhòng yào
Reducing pollution is important
污染空气很不好。
wū rǎn kōng qì hěn bù hǎo。
Polluted air is bad.
工业污染是个大问题
gōng yè wū rǎn shì gè dà wèn tí
Industrial pollution is a big problem.
政府要减少空气污染。
zhèng fǔ yào jiǎn shǎo kōng qì wū rǎn。
The government wants to reduce air pollution.
石匠用石头建造房屋。
shí jiàng yòng shí tou jiàn zào fáng wū。
Masons build houses out of stone.