in what teenagers are drinking.

显然有大幅转变
I would argue it's because back in 1970s the only thing you had to drink

我会说这是因为70年代你能买到的
was milk or water from the water fountain,

只有牛奶或是饮水机里的水
whereas, by the mid-1990s,

而到了90年代中期
90% plus of these schools had vending machines that sold soft drinks.

90%以上的学校都有自动贩卖机出售软饮料
Now I'm going to give you a sneak preview

现在我们先偷偷提前了解下
of your speaker on Monday, Brian Wansink,

你们周一的演讲者布赖恩·汪辛克
because he did a study which has actually been very influential

因为他做了一个实验这一实验实际上
in my own thinking of how to change the school environment.

对我个人就如何改变学校环境的看法影响颇大
What he did, is he went into office buildings with bowls of M&M's.

他带着许多碗装M&M豆去办公楼
He's actually done a lot of M&M studies,

他做了很多有关M&M豆的研究
which he'll probably share with you next week;

也许下周他会同你们分享这些实验