can不是介词，是情态动词，名词，动词。
My father canned those salted salmons for the long trip.
为了这次长途旅行，我父亲将那些腌制后的三文鱼装罐。
Nobody can escape from the punishment if he breaks the law.
如果一个人违法的话那他是不可能逃脱制裁的。
Could you open this can for me?
能帮我开一下这个罐头吗？
Don't put cans of petrol near the fire.
别把汽油罐置于火边
Cats can see in the dark.
猫在黑暗中也能看见东西
can不是介词，它是情态动词
