显然，把健康的人群购买保险(他们一段时间内都完全用不着保险)作为一种强制规定是一种有效拉低平均保险金的方法。
Making it compulsory for the healthy to buy insurance (which they are unlikely to need for some time) would be the obvious way to lower the average premiums.
经过靶向药物治疗的患者对治疗产生有效反应的时间(平均5个月)也比传统治疗患者(平均2个月)更长。
Those on targeted drugs also responded for longer than those who were not (five months, as against two months, on average).
今天的情况却不同了：最近一段时间以来，有效的联邦基金利率平均值已经低于0.3个百分点(相比之下，由于技术上的原因，官方利率几乎已失去意义)。
Today, it isn't: the effective federal funds rate (as opposed to the official target, which for technical reasons has become meaningless) has averaged less than 0.3 percent in recent days.
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