In 'bread knife', the word 'bread' is used adjectivally.

在词组bread knife中，bread用作形容词。

Then, he cut his finger with the bread knife.

然后，他用面包刀伤了他的手指。

"I have a bread knife, you know," she said. "Somewhere."

你知道，我有把面包刀，放在某个地方。

In the consumption of bread is not bread knife to cut, but tore a piece of bread by hand, and then into the mouth.

在食用面包时，是不用刀去切割面包的，而是用手撕下一块一块面包，然后再放入嘴中。

The long serrated knife is often called a bread knife because it is particularly good for slicing breads that require a back and forth sawing motion.

长齿刀经常被称为面包刀，因为人们在切面包时需要前后锯着切面包，长齿刀很适合这个工作。