The disease is irreversible and progressive. It takes one or two decades for the disease to develop into a stage that results in clinical symptoms.
这种疾病是不可逆转的、递进的。它需要一二十年才会逐渐显现出临床症状。
Although it is a progressive condition, many people experience years or decades without developing new spots.
尽管这是一个循序渐进的条件下，很多人还是几十年没有开发新的景点。
Agitation for effective public control of railroad rates and services antedated the progressive movement by several decades.
争取有效控制铁路运价和服务的鼓动工作，早在进步运动之前几十年就已开始。
Agitation for effective public control of railroad rates and services antedated the progressive movement by several decades.
争取有效控制铁路运价和服务的鼓动工作，早在进步运动之前几十年就已开始。
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