可以。threat是名词，意思是威胁，可数名词，所以复数的时候加s，threats。
例句：
His presence is a threat to our success.
他的出现对我们的成功是一个威胁。
The threat of an economic depression hangs over the world.
经济衰退的威胁笼罩着世界。
Pollution poses a threat to the continued existence of this species.
污染对这一物种的继续生存造成了威胁。
He took not notice of his father's threat.
他不理会他父亲的恐吓。
There was a threat of typhoon.
有刮台风的征兆。
threat属于类名词，句子We disregarded all his threats里的threats不能以它的单数形式threat出现；
threat后可接to的不定式。
The tenants disregarded their landlord's threat to expel them.
这些租客完全漠视房东要把他们驱赶出去的威胁。
threat后可接不同的介词，如of，to等。
There was then a continual threat of war.
There was then a continual threat to peace.