I've tried to do it, but unsuccessfully. I couldn't breathe and swim at the same time.

我已经试着去做了，但是并不成功，我不能同时游泳和换气。

youdao

However, seen from his viewpoints on epic, religion, and structural poetical theory, this paper holds that "Intellectual Position" is a meaningful but unsuccessfully exploration.

但从其理论来源的史诗现、宗教观和结构主义诗学观方面看，“智力空间”是一次有意义但不甚成功的探索。

youdao

The University of New South Wales had been trying unsuccessfully to commercialize the technology for 20 years, but Shi was determined to find a way.

新南威尔士大学20年中一直在尝试将这种技术商业化未取得成功，但施正荣下决心找到解决方法。

youdao

Over the past several years, the Postal Service has advocated shifting to a five-day delivery schedule for mail and packages and it repeatedly but unsuccessfully has appealed to Congress to approve the move.

WSJ: Goodbye Saturday mail? Postal Service plans cuts

Felipe tried to rejuvenate it, but unsuccessfully.

CNN: Legend Scolari sacked as Chelsea manager

Ms. Clarke fought fiercely but ultimately unsuccessfully to prevent the government from forcibly administering powerful antipsychotic drugs to Mr. Loughner.

WSJ: Tsarnaev's Lawyer Has Background Of Capital Cases