否则，它会导致合作开发合同是无效的。
Otherwise, it will lead to cooperative development contract is null and void.
无效劳动合同具有自己独特的制度功能与价值取向。
Invalid labor contracts have their particular institution function and value orientation.
无效合同的确认是合同法理论和司法实践中的重要问题。
Affirmation of invalid contracts is an important issue in both theory and legal practice.
但是，此种条款的无效，不影响整个航空运输合同的效力。
But this nullification does not affect the validity of the entire air transport contract.
无效合同是否属于合同，在我国法学界存在两种不同的观点。
一般来说，非法的合同是无效的。
无效合同是缺乏法律效力的合同。
无效合同制度的建立是解决合同效力的基础。
The establishment of the invalid contract system is the basis of realizing the contracts effect.
在我国目前的法律规定中，内容违法的民事行为(合同)被绝对地认定为无效。
Civil action (contract) whose content is illegal is absolutely invalid in our present legal provisions.
除非以书面形式做成，对本合同所进行的补充和修改均无效。
No addition or modification to this contract shall be valid unless made in writing.
第五条担保合同是主合同的从合同，主合同无效，担保合同无效。
Where it is otherwise agreed in the guaranty contract, such agreement shall prevail.
第五条担保合同是主合同的从合同，主合同无效，担保合同无效。
Where it is otherwise agreed in the guaranty contract, such agreement shall prevail.
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