面对陌生电话，要保持警惕，防止诈骗。

Miàn duì mòshēng diànhuà, yào bǎochí jǐngtì, fángzhǐ zhàpiàn.

When facing unknown calls, stay vigilant to prevent fraud.

政府发出疫情警惕，呼吁民众加强防护。

Zhèngfǔ fāchū yìqíng jǐngtì, hūyù mínzhòng jiāqiáng fánghù.

The government issues an alert about the epidemic, calling on the public to strengthen protection.

在陌生地方要时刻保持警惕。

Zài mòshēng dìfāng yào shíkè bǎochí jǐngtì.

Always be alert in unfamiliar places.