长盛轴承：公司是盾构机领域客户的二级或三级供应商，该部分收入占比较低

Core Viewpoint - The company, Changsheng Bearing, is a secondary or tertiary supplier in the shield machine bearing sector, with a low revenue contribution from this area. The company plans to monitor market demand changes in high-end equipment sectors like shield machines and explore business expansion opportunities based on its technological advantages [1]. Group 1 - The company's self-lubricating bearings are applicable in the oil cylinders of shield machines, providing precise guidance and preventing piston rod deviation, which enhances seal life [1]. - The revenue contribution from the shield machine sector is relatively low for the company [1]. - The company intends to continue focusing on market demand changes in high-end equipment sectors and will explore business expansion opportunities as appropriate [1].