The mainly research in this article is the limitation function of the Guidance Facilities System in the railway station.

本文主要研究铁路客运站中导向设施系统的限定性功能。

youdao

youdao

Another limitation of SOP is that it USES the toString function to serialize the variables and therefore cannot be used for complex variables by default.

SOP的另一限制是使用toString函数将变量序列化，因此缺省情况下它不能用于复合变量。

youdao