原级：residuum
residua的意思
1. 残渣：residentiary 居住者 | residua 残渣 | residual 剩余
2. 剩余物：residenttexteditor 常驻文本编辑程序 | residua 剩余物 | residual-velocitydifferential 余速差
1. A worker packs the residua left by the production, which can be used as organic fertilizer.