并且分析句子成分
the empire it preserves is that of the woolgrowers,sovereigns of the China's - some 123 million head - and keepers of a wool expert business worth four billion dollars.
请问:
1.这句话的谓语部分就是系动词is对吗?如果是the empire it preserves中的preserves又作何解释?
2.宾语部分是that引到的从句是吗?
还是有点不明白,it preserves是不是做the empire的补语?