She says there are two main difficulties facing food suppliers.

她说，食品供应商面临两大主要困难。

We list all our food suppliers.

我们列出了我们所有的食品供应商。

So what pet food suppliers are trying to do is incorporate plaque removal in things like treats.

因此，宠物食品供应商正在尝试做的是将去除牙菌斑纳入零食等产品中。