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It指代的是system。 本句是only开头的倒装句,the entire system may be termed hydrogeologic only when a system possesses natural or artificial boundaries that associate the water within it with the hydrologic cycle . that定语从句修饰boundaries,所以谓语用associate,定语从句里面使用了一个idiom,associate A with B. A是water,B是the hydrologic cycle. The water within it中的it值应该是系统,系统里才有水吧,如果指代boundaries的话,边界里面有水貌似逻辑不通。 |
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