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今天我们来看这样一个句子：
But detractors maintain that the terraces could also have been created by geological activity, perhaps related to the geologic forces that depressed the Northern Hemisphere far below the level of the south, in which case they have nothing whatever to do with Martian water. (TPO8, 44)
detractor /dɪ'træktɚ/ n. 贬低者，诽谤者
terrace /'tɛrəs/ n. 台地，梯田
depress /dɪˈprɛs/ vt. 使(某人)忧愁, 消沉;将(某物)压下, 拉下;使(尤指贸易)不活跃, 不景气
hemisphere /'hɛmɪsfɪr/ n. (地球的)半球;(大脑 的)半球
我是分界线，大家先自己分析哦。
But detractors maintain (that the terraces could also have been created by geological activity), (perhaps related to the geologic forces)( that depressed the Northern Hemisphere far below the level of the south), (in which case they have nothing whatever to dowith Martian water). (TPO8, 44)
分析：
修饰一：(perhaps related to the geologicforces)，插入语
中文：和地质力量有关
修饰二：( that depressed the Northern Hemisphere far below the level of the south) ，从句，修饰the geologic forces
中文：把北半球压得比南半球低很多
修饰三：(in which case they have nothing whatever to do with Martian water) 从句，修饰前一句话
中文：在这种情况下，台地就和火星上的水就没任何关系了。
主干：But detractors maintain (that the terraces could also have been created by geological activity)
参考翻译：
但是反对者认为这些台地可能是由地质活动创造的，也许和把北半球压得比南半球低很多的地质力量有关系，在这种情况下，台地就和火星上的水就没任何关系了。
这个句子的主要修饰成分就是插入语和从句，大家务必想清楚，每一个修饰成分修饰的是什么，才能看清楚这个句子的结构。
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