og205求教，谢谢。

OG205中关于althoug从句的解释不能理解，请各位大侠指点：

关于although引导的独立从句，只能修饰从句的谓语，而不能修饰前置词。

The resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, is…中although clause inside the predicate of the relative clause(that…rapidly)而the resulting flow pattern, with stationary crests and troughs although they are formed by rapidly moving air, is中although clause inside the prepositional phrase(with crests…)？？不能理解。

不可以是: althoough.......,(Sb./Sth.)+ with/in/of +sth

只能是: although..........,(Sb./Sth) +do sth

是这样子哦。

反复阅读后，我的理解是：

although 从句只能放在一个句子中，不论是从句还是主句；在C选项中：with crests and troughs that remain stationary although the air that forms them is moving rapidly

although clause是在定语从句中

而E选项中，with stationary crests and troughs although they are formed by rapidly moving air

although clause是在with短语中。

应该就是这样吧。自己说服自己了。

谢谢