'Fruitless'是英语单词，可以翻译为“无效的”、“无用的”。这个词形容某件事情或行动没有达到预期的结果，没有带来任何有益的成果。常见的用法包括“fruitless search”（无结果的搜寻）、“fruitless efforts”（无效的努力）等。
以下是9个含有'fruitless'的例句：
1. The fruitless negotiations between two countries led to the outbreak of war.（两国之间无效的谈判导致战争的爆发。）
2. He realized that complaining was a fruitless effort, and decided to focus on finding a solution instead.（他意识到抱怨是无效的努力，因此决定专注于寻找解决方案。）
3. Her fruitless attempts to reach him made her realize that their relationship was truly over.（她无效的尝试联系他让她意识到他们的关系已经真正结束了。）
4. The scientist's fruitless experiments frustrated him, but he refused to give up.（科学家无效的实验让他感到沮丧，但他拒绝放弃。）
5. Despite his fruitless efforts to win her over, he continued to pursue her relentlessly.（尽管他的努力都是徒劳无功，但他仍然不断地追求她。）
6. The fruitless harvest was a devastating blow to the farmers who rely on it for their livelihood.（无收成的收获对于靠它为生的农民是一个毁灭性的打击。）
7. The detective's fruitless investigation left him feeling like a failure.（侦探无效的调查让他感觉像个失败者。）
8. The fruitless debate between the two politicians only served to further divide the country.（两位政治家之间的无效辩论只会进一步分裂这个国家。）
9. The fruitless exchange between the customer and the sales representative ended with no resolution.（顾客和销售代表之间的无效交流以无解结束。）
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