a sweet food made from sugar or chocolate,or a piece of this:
可以是可数也可以是不可数
不可数：You cannot eat too much candy before sleep.
可数：I got a cand from mom.
chocolate既是可数又是不可数的.表示巧克力这种物质,巧克力饮料的时候不可数,比如我们说two bars of chocolate.但表示巧克力块、巧克力糖的时候是可数的.比如阿甘正传里那个经典名句：Life is like a box of chocolates,Forrest.You never know what you're gonna get.所以,两盒巧克力应该说two boxes of chocolates.