jar 阔口 bottle窄口 can金属礶
Can= 1. (食物)罐头 2. 金属容器 3. 一罐[(+of)] 
如:Add three c of water to make the orange juice. 加进三罐水调橘子汁。 
I don’t like canned food. 我不喜欢罐头食品
Bottle= 1. 瓶子[C] 2. 一瓶的容量[C][(+ of)]
姑:
He can drink two bottles of wine at one time. 他一次能喝两瓶酒。
Ann is on the bottle again. 安妮又在喝酒了。
jar= 1. 罐,坛(宽口的)瓶[C] 2. 一罐(或一坛等)的量[C]
如: We ate a whole jar of jam. 我们吃掉整整一罐果酱