application=ap-【加强含义】+plic-【折叠，引申为卷入】+-ation【名词后缀】。核心词根为plic-表示重叠、折叠。例如：accompliceapplianceapplicableapplicantapplycompliancecomplicatecomplicitycomplyduplicateexplicableexplicitimplicitimplymutiplicitypliablereplysupply等等。具体可参考手机app词根词缀记忆字典。很全的啊。