al·ter·nate

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【释义】：

a．❶ 交替的，轮流的，间隔的：on alternate days隔日．in alternate lines每隔一行．❷ 预备的，候补的：an alternate member候补委员．

－v．(使)交替，轮流：alternate between joy and grief悲喜交集．It is wrong to alternate from one extreme to another．从一个极端走到另一个极端是不对的．Wet days alternated with fine days．几天阴雨几天晴朗．We alternate crops．我们实行轮种．