It is important to note up-front that regular expressions, while very powerful, also have limitations.
必须指出的是前期的正则表达式，而非常强大的，也有局限性。
Some game learning models have been put forward but there are also some limitations.
目前已提出了一些博弈学习模型，但都存在一定的局限性。
This study still have many limitations, but also have some issues for further in-depth study.
本研究还存在诸多局限性，还有些问题需作进一步深入研究。
This study still have many limitations, but also have some issues for further in-depth study.
本研究还存在诸多局限性，还有些问题需作进一步深入研究。
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