天空出现了怪异的云彩，许多人认为这是一个不好的预兆。
tiānkōng chūxiàn le guàiyì de yúncǎi ， xǔduō rén rènwéi zhè shì yígè bùhǎo de yùzhào 。
Strange clouds appeared in the sky, and many people thought it was a bad omen.
医生说，早期的症状可以被看作是疾病的预兆。
yīshēng shuō ， zǎoqī de zhèngzhuàng kěyǐ bèi kànzuò shì jíbìng de yùzhào 。
The doctor said that early symptoms can be seen as a prognosis of the disease.
在古代，人们常常通过观察天象来判断预兆。
zài gǔdài ， rénmén chángcháng tōngguò guānchá tiānxiàng lái pànduàn yùzhào 。
In ancient times, people often judged omens by observing celestial phenomena.