alternate SC交替的副载波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 trunk line替代干线alternate coding key备用代码信息标号alternate key strobe交替击键Alternate irrigation交替灌水alternate walk-run走跑交替alternate phyllotaxy互生叶序alternate directions交错方向alternate set system交替练习方法alternate proportion更迭比例alternate permutatio交错排列