alternaterows隔行alternatev.交替；轮流adj.间隔的；轮流的；交替的n.代替者；供替代的选择alternate sunshine and rain时而天晴, 时而下雨alternate wire-feed system(焊接用语) 变速送丝方法alternate paired case method[医] 双交替病例研究法alternate wetting and drying干湿交替alternate card device source交替卡片设备源alternate wettkng and drying干湿交替alternate collating sequence另外排序序列alternate-bay construction隔仓施工法alternate current signalling交流信号方式alternate production methods轮流生产方法

1. Farmers rotate crops in the field.
   农民在耕地上轮栽农作物。
2. Ploughing the field and sowing seeds is the first thing we should do right now.
   耕地播种是我们现在该做的头一件事。