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1·The main clause and subordinate clause of compound sentence must have subject and predicate, as same as the simple sentence.

复合句的主句和从句也和简单句一样，必须有主语和谓语。

2·The main clause and subordinate clause of compound sentence must have subject and predicate as same as the simple sentence.

复合句的主句和从句也和简单句一样，必须有主语和谓语。

3·The reason which leads to the asymmetry is that these nouns experienced changes from predicate-object verbal phrase to predicate-object compound noun in their construction process.

原因在于其在形成过程中经历了由“述宾式动词词组”到“述宾式复合名词”的演变。