她收到了来自陌生号码的威胁短信。

She got text messages with ___threats from an unknown number.

非法倾倒的化学品对当地水源构成了严重威胁。

Illegally dumped chemicals pose serious ___threats to the local water supply.

经济衰退的威胁让许多企业感到担忧。

The ___threat of an economic recession worries many businesses.