从上述世界研究现状中可以看出，目前关于地下空间的研究中主要是集中在方法

It can be seen from the above world research status that the current research on underground space is mainly focused on methodological research, and the research on basic theory is relatively weak, which makes the underground space quality assessment method lack theoretical basis and support.

From the above-mentioned world research, we can see that the current research on underground space mainly focuses on the study of methodology, the study of basic theory is weak, which makes the underground space quality assessment method lack of theoretical basis and support.

It can be seen from the above research status in the world that at present, the research on underground space is mainly focused on methodology, and the research on basic theory is relatively weak, which makes the evaluation method of underground space quality lack of theoretical basis and support.