短語詞組短語secondary resizing operation 二次加工secondary tillage operation s 整地作業(yè)secondary brake operation 輔助制動器工作secondary sizing operation 二次定型加工secondary recovery operation 二次采油作業(yè)stable secondary cohomology operation [數(shù)]穩(wěn)定二階上同調(diào)運算secondary cohomology operation 二階上同調(diào)運算secondary direction of operation 次要作戰(zhàn)方向 返回 secondary operation