喝牛奶真能强化骨骼吗?
But demonstrating a definitive link between the consumption of milk and the possession of strong bones is harder than it sounds. The ideal study would take two large groups of people and randomly assign every member of one group to drink plenty of milk daily for several decades, while the other group would drink some kind of milk placebo instead. Obviously, this is too difficult to do in practice.What we can do instead is to take many thousands of people, ask them how much milk they’ve been drinking over the years, and then follow them for at least a decade to see whether the people who regularly drink milk are any less likely to suffer from broken bones later in life.
可是要证明喝牛奶和骨骼强壮之间存在必 然联系其实很难。理想状态下，研究需要有两组人数众多的参试者，随机要求其中一组连续几十年每天都喝一定分量的牛奶，而另一组则饮用没有任何效果的安慰剂。显然，这样的研究难以实践。但我们可以找几千个人，问问他们这些年喝了多少牛奶，然后追踪他们10年以上，看看经常喝牛奶的人之后发生骨折的概率是否更低。
1. demonstrate 英 [ˈdemənstreɪt] 美 [ˈdemənstreɪt]
v.证明;证实;论证;说明;表达;表露;表现;显露;示范;演示
第三人称单数： demonstrates 现在分词： demonstrating 过去式： demonstrated 过去分词： demonstrated
2. definitive 英 [dɪˈfɪnətɪv] 美 [dɪˈfɪnətɪv]
adj.最后的;决定性的;不可更改的;最 佳的;最完整可靠的
派生词： definitively adv.
3. random 英 [ˈrændəm] 美 [ˈrændəm]
adj.随机的，随意的(非事先决定或不规则)
n.随意
派生词： randomly adv. randomness n.
4. obvious英 [ˈɒbviəs] 美 [ˈɑːbviəs]
adj.明显的;显然的;易理解的;公认的;当然的;平淡无奇的;无创意的;因显而易见而不必要的
派生词： obviousness n. Obviously adv.
5. several 英[ˈsevrəl] 美[ˈsevrəl]
det./pron.几个;数个;一些
adj.各自的;分别的
