alternates
v.
交替( alternate的第三人称单数 );
（使）交替， （使）轮换;
例句:
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In most jurisdictions, twelve jurors and two alternates are chosen.
大多数辖区都会选出12名陪审员和2名候补陪审员。
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The flood and ebb tides alternates with each other.
涨潮和落潮交替更迭.
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He alternates joy with grief.
他时喜时忧.
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The narrative alternates between present menace and Kvothe's past.
来自THETIMES
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In doubles matches, the serve alternates between players as well as teams.
来自BBC
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This region encompassing northern Niger and northern Mali alternates between wet and dry seasons.
来自VOA