诉讼时效期间是诉讼时效制度中的一项重要内容，它直接关系到请求权人的权利能否继续获得法律强制保护的问题。

The negative prescription period is an important content within the negative prescription system, it directly relate to the creditor's right that if can continue to be protect by laws.

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诉讼当事人往往基于现实的需要而未约定债务的履行期限，目前，我国学术界对未定履行期的请求权的诉讼时效期间的起算意见未达成一致。

There are different views in academic circle about how to ascertain the beginning for calculating the prescription period of Anspruch of unascertained deadline for performance.

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第一百三十九条在诉讼时效期间的最后六个月内，因不可抗力或者其他障碍不能行使请求权的，诉讼时效中止。

Article 139 a limitation of action shall be suspended during the last six months of the limitation if the plaintiff cannot exercise his right of claim because of force majeure or other obstacles.

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