alternate days
collocation每隔一天
I go swimming on alternate days.
我每隔一天去游泳。
交替的；轮流的
先理解核心含义，再看它在真实句子里的用法。
交替的；轮流的
happening by turns; first one and then the other
Alternate lanes are closed for construction.
交替车道因施工关闭。
交替发生的；轮流进行的
Happening by turns; one following the other in succession of time or place; first one and then the other (repeatedly).
每隔一个的；每第二个的
Designating the members in a series, which regularly intervene between the members of another series, as the odd or even numbers of the numerals; every other; every second.
互生的(指叶子在茎上交替排列)
Distributed singly at different heights of the stem, and at equal intervals as respects angular divergence
We meet on alternate Fridays.
我们每隔一个周五见面。
She works alternate shifts to support her family.
她轮班工作以养家。
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每隔一天
I go swimming on alternate days.
我每隔一天去游泳。
每隔一周
The two teams train on alternate weeks.
这两支队伍每隔一周训练一次。
互生叶
This plant has alternate leaves arranged along the stem.
这种植物的叶子沿茎互生排列。
内错角
The two parallel lines create equal alternate angles.
这两条平行线形成相等的内错角。
隔行；交替行
Farmers planted the young trees in alternate rows.
农民们把树苗隔行栽种。
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alternate 里有 alter（改变），想象两种状态轮流“改变”位置：交替、每隔一个。
语域：neutral 常见场景：时间或动作的交替、计数中的每隔一个、植物叶序 该词作形容词时通常属于中性语体，多用于描述按顺序交替发生、每隔一个出现或叶子互生等场景，在口语和书面语中都较常见。
形容词用法，直接修饰名词，如 alternate days（每隔一天）。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.