Her confidence has been slowly eroded by repeated failures.

她的自信心因屡屡失败慢慢消磨掉了。

《牛津词典》

Animal experiments by psychologists at the University of Pennsylvania had shown that after repeated failures, most animals conclude that a situation is hopeless and beyond their control.

宾夕法尼亚大学的心理学家进行的动物实验表明，在多次失败之后，大多数动物都会作出这样的结论：情况已无可救药，超出了它们的控制范围。

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Repeated failures discouraged him.

屡次的失败使他气馁。

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BP's repeated failures to control the spill have angered politicians, the public and the company's own shareholders.

WSJ: BP Promises to Keep Money Flowing to Gulf Residents

After repeated failures with fancy, boldface signings, this is a low-profile team purposefully constructed to be a team.

WSJ: Jason Gay: Lundsanity's No Passing Fad

Repeated failures of the Bulava intercontinental ballistic missile caused embarrassment for Russia, though two successful tests were reportedly conducted last year.

BBC: Russia plans $650bn defence spend up to 2020