one mug of filter coffee: 140mg
一杯滤挂咖啡：140毫克
one mug of tea: 75mg
一杯茶：75毫克
one can of cola: 40mg
一罐可乐：40毫克
one 250ml can of energy drink: up to 80mg
一罐250毫升的能量饮料：最多80毫克
bar of plain chocolate: less than 25mg
一条纯巧克力：少于25毫克
bar of milk chocolate: less than 10mg
一条牛奶巧克力：少于10毫克
The researchers say coffee drinkers should stick to "healthy coffees" - which avoid extra sugar, milk or cream, or a fatty snack on the side.
研究人员表示，喝咖啡的人要坚持喝“健康咖啡”，不要另外加糖、牛奶、奶油，或者高脂肪零食。
And they are calling for rigorous clinical trials on coffee intake to find out more about the potential benefits to health.
研究人员提议对咖啡摄入量进行严格的临床试验，以对咖啡潜在的健康益处有更多了解。
At present, the researchers said pinning down exactly how coffee might have a positive impact on health was "difficult".
目前，研究人员表示精确指出咖啡如何有益健康“有些困难”。
（编辑：何莹莹）