轮作作物  Rotational crop

年轮年表  Tree-ring Chronology

年轮年代学  dendrochronology

树木年轮年表  Tree-ring Widths; Tree-ring Chronology

树木年轮年代学  dendrochronology

耕作年限  Cultivation age; Cultivation history

工作年限  working years; work duration; working life

工作年限损失  backward learning algorithm

合作年限  duration of the cooperative operation

设计使用年限100年  Design Useful Life of 100 Years

4年轮伐制  rotation cutting system

把作轮廓的纸贴在……上  overlay

泵的工作轮  pump runner

泵工作轮  pump runner

变矩器叶轮轮毂  converter impeller hub; torque converter impeller hub

菠萝－甘蔗轮作  Rotation of pineapples-sugarcane

不同轮作方式  different rotation systems

菜粮轮作  Vegetable-grain rotation

操作轮  hand wheel; handwheel