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1·The goal has now been finally attained through their dauntless and persistent efforts.

经过他们百折不挠，再接再励的努力，现在终于达到了目的。《新英汉大辞典》

2·The goal has been finally attained through their dauntless and persistent efforts.

他们百折不挠，再接再厉，终于达到了目的。