Before revision:  Traditional algorithms simply consider strong protein complexes that can be found in the original network by optimizing some metrics, which causes obstacles for the discovery of weak and hidden complexes shielded by stronger complexes. Also , protein complexes are not only in different density but also in a large range of scale, making it extremely difficult to be detected.
After revision:  Traditional algorithms simply consider strong protein complexes that can be found in the original network by optimizing some metrics, which causes obstacles for the discovery of weak and hidden complexes that are overshadowed by strong complexes. Additionally , protein complexes are not only in different density but also in a large range of scale, making it extremely difficult to be detected.