旅游合同具有附延缓期限，生效于成立之后的旅游开始。
The Tour Contract has the characteristic of delaying and is effective after the establishment of tourism.
附终止期限的合同，自期限届满时失效。
商品房预售是一种附期限的法律行为，交易的标的和预售合同的内容都具有特殊性，进行预售需要具备一些基本条件。
The objection of this transaction and the content of the contract is special. To presell the apartment, the seller must obtain some basic conditions.
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