With two targets left, you need to figure out the next question to ask, in order to distinguish between them.
留下两个目标之后，需要找出下一个要问的问题，从而区分这两个目标。Highways are an intermediate case where exclusion is possible only at a significant cost, and thus should be avoided if possible.
高速公路就是这样一种中间产品，它只有在付出相当成本后才能区分使用者，因此是需要尽量避免的。Missoula, Montana, is one of these towns, but it possesses some indefinable spirit that keeps it from being confused with any other.
蒙大拿州的米苏拉就是这类城镇中的一个，但它有某种难以说明的精神，能将它和其他城镇区分开来。Smoking is now something of a class indicator, separating the workers from the management.
抽烟现在成了划分阶层的某种标志，用以区分工人和管理人员。The committee noted that consumers might want to see effective labelling to be able to distinguish such products.
委员会注意到，消费者们可能会希望在商品上看到有效的标签，以区分克隆产品。The distinction is sometimes hard to see because we get so used to the excise being part of our tasks.
二者有时很难区分，因为我们习惯于附加工作成为任务的一部分。It must be emphasized, however, that this is more a question of degree than of distinction.
不过，应该强调一下，这更主要地是个程度问题，而非本质区分。Thinking it a mark of distinction, the dog grew proud of his bell and went tinkling it all over the marketplace.
把它看作区分标志，狗戴着铃铛变得很自豪，铃铛声响遍了整个市场。The distinguishing characters seem to be only a matter of degree, and the variation pattern should be studied in the field.
区分的特征好像只是程度的问题，并且变化式样应该被在野外研究。