如果要表示某个生物没有食物可以用 "They don't have food." 来表示。这是英语中常用的表达方式。

这句话的来源是英语中的常用句型，它的基本结构是"have" + 名词 + "to do"。例如：

I have a lot of work to do. (我有很多工作要做。)
They don't have time to wait. (他们没有时间等。)

下面是几个使用 "They don't have food." 这句话的例句，以及它们的中文翻译：

"The refugees don't have food or water. They need our help." (难民没有食物或水。他们需要我们的帮助。)
"The stranded hikers don't have enough food to last the night. They need to be rescued." (被困的徒步旅行者没有足够的食物度过这一晚。他们需要获救。)
"The abandoned puppies don't have food or shelter. They are in danger." (被遗弃的小狗没有食物或庇护所。他们处于危险之中。)