圣诞节后的第八天，他出国了。
On the eighth day after Christmas, he went abroad.
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她在第八天放弃了。
She gave up on the eighth day.
在圣诞节的第八天。
On the eighth day of Christmas.
第八天晚上，我比往日更加小心地推开房门。
Upon the eighth night I was more than usually cautious in opening the door.
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