secedes
v.
脱离，退出( secede的第三人称单数 );
例句:
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Province of Guanacaste secedes from Nicaragua and becomes part of Costa Rica.
来自BBC
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The north's economy will take a mighty hit when the south secedes.
来自BBC
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In one month, Southern Sudan will hold a referendum to decide whether it secedes from the north.
来自VOA