To say is one thing,to do is another.请问这句话怎么理解To say is one thing,to do is another.请问这句话怎么理解主谓一致?

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To say is one thing,to do is another.请问这句话怎么理解
To say is one thing,to do is another.请问这句话怎么理解主谓一致?