Reducing a rule to its principle says that, for the purpose at hand, the principle cannot be questioned or further derived unless you create a new rule.
通过将规则还原为原则，对于当前的用途，除非创建新规则，否则不能对原则进行质疑或进一步派生。
However, exhibitors with hand-carried goods to the show, they should then declare to customs at the airport that their hand-carried goods are for exhibition purpose.
但是，如果展商携带手提展品参展的话，应在机场报关，申明货物用于展览之用。
However, exhibitors with hand-carried goods to the show, they should then declare to customs at the airport that their hand-carried goods are for exhibition purpose.
但是，如果展商携带手提展品参展的话，应在机场报关，申明货物用于展览之用。
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