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 parent交互亲代alternate torque交变扭矩alternate member候补会员alternate courts交换发球区alternate sector备份扇区alternate finger备用抓手alternate spring交替泉alternate target备用目标, 补加目标alternate system迭亮系统alternate device辅助设备

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