广播电视英语短句 第 92 课：能量饮料-3

Some contain as little as fifty milligrams, others as much as five hundred. 有些饮料的含量少到 50 毫克，而多的多达 500 毫克。

By comparison, a cup of Starbucks brewed coffee contains three hundred thirty milligrams in four hundred seventy-three milliliters. 比较起来，一杯 473 毫升泡好的星巴克咖啡中，含有 330 毫克咖啡因。

Some energy drinks contain a mixture of ingredients listed as an "energy blend." 一些能量饮料含有一种被称为“能量混合物”的东西，它由不同成分混合而成。

Ingredients like taurine, guarana and inositol are natural substances. 这些成分中例如牛磺酸、瓜拉那以及肌醇都是天然物质。

But Chad Reissig says scientists do not know a lot about them and how they interact with each other and caffeine. 但是 Chad Reissig 称科学家们对这些东西了解得并不多，对于它们之间的相互作用以及它们与咖啡因之间的相互作用也了解得不多。