这句里面的between them是指二个人合起来赚27k，还是每个人赚27k呢？不是很确定
For example, if a household consisting of two adults earns £27,200 per year between them, there is a high likelihood that this household will be found in the fifth income decile.
However, this is not guaranteed, because different gross household incomes can result in different net household incomes, depending on how many earners there are in the household, the size of the household, and which benefits the household qualifies for.
因为里面举了一个Cameron的例子，如果是两个人的收入的话，这里就直接假设他太太没有收入了，所以又觉得好像是指一个人的收入
Even the prime minister’s salary – £142,500 – is below the median for the top 10% of couples with two children.
我读的时候也是觉得是指家庭的总收入，但突然读到说Cameron的收入140k也达不到top decile的(5) 151k。
Even the prime minister’s salary – £142,500 – is below the median for the top 10% of couples with two children
这时候我就想，究竟(5)的151k是指一个人的收入，还是一个家庭household两个人的收入。
如果是指household的收入，那原文不应该这样来类比的，
以Cameron一个人的收入和一个家庭的收入比，这挺勉强，也挺没意义的。
这时候，我重读了原文n多遍，一直只是说household，并没有说household income, 或income of household，
因为第一栏（1）是1 adult，是指1个人，而(2)-(5)是指household。有些统计为了好比较（都是一个人），(2)-(5)的统计范围是以家庭为单位，但是里面的数字是指一个人的收入，这样可以和(1)的1个人的收入可以有个清晰的对比。
如果原文作者不是加入了Cameron这个不恰当的比喻，我就不会问这个问题了。
我唯一觉得有说服力的一句就是这里面的between them,
For example, if a household consisting of two adults earns £27,200 per year between them, there is a high likelihood that this household will be found in the fifth income decile.
我就想究竟这between them是指一个人的收入，还是二个人加起来的收入。我刚开始不是很确定，但静下心来觉得还是指二个人加起来的收入，between them就是指不管你们两个人怎么分，加起来是这个数就行了。
:lol