弱點會帶來更多弱點，現在總統的關稅權力受到限制，美國的貿易夥伴可能會更加大膽，對美方採取更強硬的立場。
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tuples and consume() generates code that acts on the tuples once they are produced. Usually the parent operator calls produce() on its child and the child calls consume() on its parent once it generated the producing code. Note that produce()/consume() do not exist in the generated code but only during the code-generating phase. Let’s look at