In American history our reform crusades have usually had to do with one of several objects or purposes or problems.
在美国历史上我们为理想而进行的改革,通常与如下几个目的,或意图,或者问题之一有关联
Because the IFs are saying, if it's true do this, otherwise skip on it.
因为IF是这样的,如果结果是真的,进行如下操作,如果不是那么跳过它吧。
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