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70.白云苍狗（bai2 yun2 cang1 gou1）
意思是天上的浮云像白衣裳（shang），顷（qing）刻之间又变得像黑狗。
旧时比喻世事的变化无常。
It means that the floating clouds in the sky are like white clothes, and instantly they become like a black dog.
In old times it is a metaphor that the world is volatile(adj. 易变的，不稳定的；（液体或油）易挥发的；爆炸性的；快活的，轻快的).
Volatile:volatile
英 [ˈvɒlətaɪl] 美 [ˈvɑːlətl]
adj.
不稳定的;易挥发的;易变的;无定性的;无常性的;可能急剧波动的;易恶化的;易发散的
派生词： volatility n.
英英释义
noun
1
a volatile substance
it was heated to evaporate the volatiles
adj
1
tending to vary often or widely
volatile stocks
volatile emotions
2
marked by erratic changeableness in affections or attachments
fickle friends
a flirt's volatile affections
Synonym:
fickle
3
liable to lead to sudden change or violence
an explosive issue
a volatile situation with troops and rioters eager for a confrontation
Synonym:
explosive
4
evaporating readily at normal temperatures and pressures
volatile oils
volatile solvents
双语例句
全部 不稳定的 易挥发的 易变的
1
Petrol is a volatile substance.
汽油是挥发性物质。
《牛津高阶英汉双解词典》
2
The international oil markets have been highly volatile since the early 1970s
从20世纪70年代初开始，国际石油市场就一直很不稳定。
《柯林斯高阶英汉双解学习词典》
3
He accompanied the volatile actress to Hollywood the following year
第二年他陪着这位情绪无常的女演员去了好莱坞。
《柯林斯高阶英汉双解学习词典》
4
It's thought that the blast occurred when volatile chemicals exploded.
人们认为，易挥发的化学物质爆炸时产生了冲击波。
《柯林斯高阶英汉双解学习词典》
5
Armed soldiers guard the streets in this volatile atmosphere.
目前局势动荡不定，有武装士兵在街道上警戒。
每天分享外语知识，请点击【点赞】、【关注】，不漏掉任何一期，助你提高外语水平。
（《汉语成语词典》上海教育出版社1978）（参考《百度翻译》）（拼音后数字表示声调）
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回答时间：2022-12-07 05:29:11