Question

一般说a slice of tomato但是不知道能不能用a piece of tomato呢?

Answer 1

This is not exactly correct. We should use "slice" when referring to tomato like this:

http://www.***.com/img/box/969.jpg

piece of tomato

http://us.cdn2.123rf.com/168nwm/galaiko/galaiko0902/galaiko090200053/4286080-a-piece-of-tomato-isolated-on-a-white-background-background-blurry.jpg