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alternatebay construction(混凝土用的) 隔仓施工法alternate addition method交替加入法alternated magnetic field交变磁场Alternate Liaison Officer后备联络官Alternated Launch Officer预备发射官alternate digit inversion隔位反转Alternate mode chromatism调式交替性半音化alternate renewal process交错更新过程alternate line of defense预备防线alternate interior angles内错角