直到去年2月他才宣布自己将竞选总统。
It was only last February that he announced he would run for president.
直到去年该党还一直处于政治舞台的外围。
The party remained on the fringe of the political scene until last year.
直到去年，黄石国家公园的狼群数量已经增长至超过170匹。
By last year, the Yellowstone wolf population had grown to more than 170 wolves.
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