marginal sucker

例句：

1. 1.The plant's ability to survive in the harsh environment is due to its marginal suction system.
   这种植物能在恶劣环境中生存，得益于其边缘吸盘系统。
2. 2.The researcher found that the marginal suction of the robotic arm was sufficient to lift the heavy object.
   研究者发现机器人手臂的边缘吸盘足以举起这个重物。
3. 3.The scientist used a microscope to observe the marginal suction between the two surfaces.
   科学家使用显微镜观察两个表面之间的边缘吸力。