adj.珠状的
adv.一滴一滴地
By the surface energy theory, the difference of solid-liquid surface free energy become bigger as vacuum increases.This is good to dropwise condensation. 根据表面能理论分析可知，真空度越大，等离子管表面的固液表面自由能之差越大，凝结朝着有利于珠状凝结的方向发展。
