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