The baseball game has no specific length but lasts until the 9 innings are completed.

棒球比赛没有固定的时间,但必须打完九局,比赛才算结束.

Then, the effect of the web density and the specific length of elementary plane on the pore structures, and the relationship between the fractal dimension of pore size dist…

在此基础上研究纤维网单位面积质量和特征长度对纤维网结构的影响，以及孔径分布分形维数与通透性能之间的关系。

A diplomatic official of the highest rank appointed and accredited as representative in residence by one government or sovereign to another, usually for a specific length of time.

被任命的最高级别的外交官，作为一国政府或国王派驻在另一国的代表，通常有固定任期。